diff --git a/day21-input.txt b/day21-input.txt
new file mode 100644
index 0000000..3e7ebd0
--- /dev/null
+++ b/day21-input.txt
@@ -0,0 +1,2979 @@
+lsdv: fbnj * rhjt
+jggb: rdpd + cqzw
+ctqr: hnbn / zprm
+qpmw: 5
+vqhj: tbhz * jflr
+hppq: 3
+zlmd: wjnh * grdc
+wzfm: dmgm * pjwp
+nfqq: dlgl + mcpl
+hqdz: gjpf + cqdg
+dthw: 1
+htrz: 5
+tzgs: fzzb + lzbt
+ddzz: rdfd * zqmg
+mvdj: fgfh + smrh
+htvq: 2
+btjd: djln + njrn
+nzlc: qmsl + dvww
+cpvb: 4
+srmr: ccht - vwwb
+crqf: 3
+hdvj: 3
+rnmb: 2
+bvcl: nlzn + rsdg
+tsnj: 3
+ztnv: cfjj + bftm
+fqqn: 11
+smrz: 5
+rwgc: 2
+vjvf: 3
+cmhc: 3
+sgmj: fntf * dfhf
+nmlw: drfc * wtsv
+hbjp: nfqt + cvnr
+hjpm: 2
+fbmg: vvzl * fdnq
+bgct: hqhz + jqjp
+ssvr: qbcs - sgqw
+sfhw: smrz * cmhc
+vmtf: 18
+nvhf: 2
+gtgq: 9
+hznc: 5
+nwpt: wdbj * gbsh
+rgsh: nlwr / gjqf
+mmln: vdrh * ssrb
+pbsj: srdn * lqvh
+bjcm: 12
+nrjp: 3
+pzjq: 17
+rhtt: 14
+fvgc: 3
+cfqw: cqmq + mmqt
+mgcc: jtwt + btvv
+ntgb: 5
+ctcv: tccv + qqww
+mwpd: hqrq / wbfm
+vfmw: mgzf + gdsg
+lzmp: mcvt * gqwb
+bpnl: 7
+bmww: hpfb * cgzn
+nlgt: 4
+lfzz: 6
+zdpj: rlff * jcnq
+brwl: zlms * gnmt
+ntnh: nmlw * tjmv
+tdqg: 5
+nqfj: jpnn + wnlv
+wmpp: 5
+pfws: 1
+hhrv: 5
+fpbs: jbcp - gcbr
+wdmq: 2
+nsjp: 13
+pzjc: 2
+vgwt: 2
+wdqp: zlct + tptm
+brzv: 11
+svth: cprz - wbwf
+vlfj: hhcb * qgfd
+qvng: ttww * wfzb
+fbjz: jndl + hglp
+wcwf: mvrm + mbdv
+zqlz: 9
+dzdr: 12
+zmlj: bccn - rmpd
+hpzc: gwld * gdpb
+jpnn: gwqz + vhzq
+zdll: mnff + dpct
+lhrf: jdnj - vhnt
+zfbp: 2
+vdzj: 3
+fdgm: whpw + vqzs
+dcgf: 4
+gpsn: 1
+vqvw: gchp * jtjm
+jhfj: gjqs + jflt
+bfpw: 3
+root: wrvq + vqfc
+wsrh: 2
+qwgb: 3
+fgfh: mzvl * bfcf
+gdcz: 11
+vsqs: 4
+gzvj: dtjb * hhss
+pwbl: zzrq / cmmf
+dtjb: 2
+lqpb: mztw + pcts
+wnbq: dhzm + fwsl
+fdcb: 15
+fhzp: zcrh / lszr
+ltcm: wggp + mpdj
+zbdv: 4
+bqwc: rdcz + jnlf
+fncz: wnbq + qdjv
+jfgd: 9
+jvms: 12
+tlwj: twct - wjlf
+sqwp: 2
+tgcb: 3
+lpnr: sndd * jnfv
+qzft: 1
+hsvm: 4
+gjtm: fvfz * rhfn
+vzdj: qznh + qzlb
+nzdt: cqbd * scms
+nhlz: 17
+qsgd: 3
+wgpb: 4
+sqtp: 3
+rlll: fbjz - vnlv
+jllr: jqnj * bpnl
+vprp: 3
+hhwm: 19
+lvsn: mfcv * nbmn
+shqc: 3
+cgbw: dqhs + bczr
+twvf: mtlr * rcpn
+wblz: gnjz + pjqp
+tsws: 3
+nfbd: 15
+dvjn: qlqp * pzlm
+slgz: swfz * dczm
+ldfr: jghq + cgbl
+drfc: 2
+rlzc: 16
+qhbd: 2
+bdwn: 7
+fddg: nrbm + ptjr
+jccb: 5
+dzhn: 5
+ndrh: 1
+jmbq: 5
+crdh: 19
+cpjd: rrss + gbhg
+bhqb: pbdt + ctpp
+fjnp: 11
+wbvl: 4
+twlg: ncqs + bnfb
+jphj: rsvb + cnpc
+dclr: ntjt + nqpg
+dnds: svpm + rmrw
+ngvp: 13
+bqds: dlbh * tfzs
+zvlg: dvjn * rzsr
+snnw: hdgl - mzhd
+nmtq: 2
+jffl: 8
+ngdt: 2
+vsqz: tzft + nhlw
+tvlp: 16
+tljj: nsjq * lrwg
+zlct: mfhl * dqgg
+lcmv: hthq + mpsz
+cdlz: lzjv * mnjr
+hlgn: 2
+ddrv: wntb + wdcc
+hdjz: vtgb * hhcs
+rhqb: lpvc + bfcd
+ttrm: 20
+jsnn: gfwl + jwfj
+jdft: 5
+dfsz: ljcf * pcst
+cjzd: qnms - shgz
+grmn: 4
+ftwj: 6
+mlhq: 20
+vdwt: 20
+bznb: tbqp + rhrm
+jhgl: 6
+mdnc: wrql + pjln
+hzrb: 2
+mpsz: zjpq + vvzh
+flnw: sbsc + zrbs
+mrgd: 4
+fzvh: 6
+mswm: 2
+jnbr: mtdm * wcrz
+nlhg: bbvv + cjlp
+qtmt: qsjz - htrl
+lgzd: tzgs + pcgg
+vqfc: vhhd * qbpd
+mtbz: thsv * znbp
+ltll: 4
+vqqp: bwhz / lrsc
+nvdb: 5
+sbvv: mjtq * vqpd
+vwjh: 8
+htzg: 2
+jzsg: 14
+vzwv: 13
+wbzd: hwvf + hwpv
+qcht: 2
+hwtn: 4
+njqt: drht + ttgg
+nlff: rjzt * rhtt
+bpmm: 3
+gnlf: gndr / vrhb
+nfqz: tgcb * vhfn
+gcrt: nnrf * qjqv
+rhrm: zqlz + mrms
+drvj: 6
+czjf: qlnd + jdjd
+gwsb: 5
+nwpc: 18
+wcrz: qdfv * zcwn
+wcml: 5
+bwrd: 2
+sjnl: 5
+stqg: fgtl / lwzn
+fbvd: zmzz + gctj
+lnzz: pdsf * qpvq
+zfpm: jgrm + vqww
+vbdt: 17
+srsz: 5
+tljr: hzsz * bhqb
+dfcq: jczd * gpzv
+smhr: 3
+qczw: cngh * hntn
+rmjf: 4
+spdg: gldd + zflj
+bqjb: 5
+gfdn: 12
+vtnj: qczw + fjmd
+dnrr: 1
+trpw: vsqs * vcfs
+pppw: mmwr * vqts
+tnzm: prlm + mhps
+flmf: 14
+ngpq: pwzl * mjzl
+wthl: vnpt + grgh
+mjms: nhgn + htjg
+gndr: fdrs * hljd
+qsvb: 4
+mrzl: 4
+lmhr: 20
+dpjz: zbhn * gbhl
+ldgf: 5
+tzcw: hjbq + qpng
+pwzl: 3
+vjzr: 2
+fjgp: cswl * fltg
+bvpn: wcpj * fbvd
+lqjd: 1
+bfzv: lgzd + tvtb
+blqp: mqzn / csbf
+rcbw: 6
+qcsh: 2
+dfvf: mtvf + zcrl
+gslf: 2
+vmqj: 2
+rmrw: nbwr * ncdl
+flhn: 2
+rhjp: vfzb * ptqj
+lmdd: 9
+czqr: 2
+ddrl: 4
+sqbh: 5
+jfrt: 7
+nsrb: 6
+wjqr: vlbq * cbmz
+pgsd: 4
+mvrb: 7
+lsqv: hhjr + mnjm
+bfnl: 4
+phbz: gnrz + gbtq
+lfct: 3
+rmlz: rdzt + gcbs
+frdc: 9
+mqfc: 5
+sjfb: qjwg * vmqj
+rjwb: fjhh + rbcq
+cfwj: nfvl * czrg
+crmj: 8
+zcrl: 12
+hslb: 15
+sjbc: zznc * dsdr
+lspf: 2
+zgdb: jtcn + lrcv
+wplt: 3
+zrjt: 4
+mhgs: 6
+zngj: 3
+fqsn: 10
+vrmq: zdll + qvdj
+dfjg: 17
+gpwb: hcjb * rdjn
+cmqg: glqp * bmqs
+mbcr: tszr * npbn
+hfjw: tcrl * zsgb
+mdwt: tzhb * vlvh
+ptpj: 4
+nmlh: dwrd * ftjw
+scms: 9
+bwhj: 5
+rvfv: zcfc * sqwp
+zlfw: 14
+pfjr: 4
+qdsb: flmf / cbcv
+nrbm: vmpc * fsfs
+bgmd: fjgp + qnzd
+prlm: 13
+rlvq: qwdp + slgl
+nngm: dnjc - nrnm
+vzdl: 2
+rmpd: zswh + jbsn
+jwtr: sgsq * qvwz
+nncj: 2
+fgjj: mswm * czjf
+qppr: 5
+wfzl: 3
+wmfj: cnch + mqgh
+bcnq: wjqp + ptdh
+ztzs: wjhl * lpdv
+wcpc: jprs + mzth
+lnwt: 2
+rfjz: cqjp + fbnt
+ffnf: 7
+gmmf: 3
+jzdb: cnfh * ttpt
+tsth: 3
+bnfb: 4
+jnpv: 3
+dbbm: 3
+qcls: 8
+fsqs: ppvm * fqlm
+tdnc: 4
+hrwn: vgcc + swct
+bgrf: 4
+bvqn: 4
+rmbp: lzgt * zwtr
+hwdm: 11
+fjbr: 20
+hjhz: wzzb * nwpt
+tjfg: 13
+pfhl: qpfn * jfhb
+brzb: nvhg * vfpl
+nlwd: 2
+nvzq: 14
+wwvq: 2
+tnvr: wqtz + bcnq
+gzvv: 2
+cztp: 3
+mmlt: 2
+tspz: 2
+vnpt: 18
+tlvd: 11
+tchw: 2
+ljzd: zmtt + swss
+sqzt: 17
+hpzr: 4
+lnfv: 2
+hwzm: jzln - zcsf
+dqsh: mwbn + rccq
+tnmf: wclb * fqqn
+frtf: nfrh + dpfh
+rpll: 3
+zrpq: 19
+jzhj: cftm + hlrd
+nhqv: 3
+wfnj: 2
+lpwp: ttmt + ntgw
+hnbn: zvpb * wfrt
+cfrn: 3
+sndd: 3
+dcbs: stvs + svcb
+jbsn: bhwn + ncph
+tzhb: 3
+nhlc: rjjp * mngf
+vsgq: nlgt + cthr
+dpct: 5
+zbjf: pfbw + ljqq
+mwjd: 3
+bsjp: 10
+rhgf: 2
+dhwp: 3
+prqw: zqzw - vtzh
+flbr: 13
+qsjl: 3
+ppgl: mldj + hbmd
+snqz: 5
+zcvf: 2
+wvht: wdvs * mlzb
+rnqp: lpbn - stgl
+hrfq: qbvs * mmlc
+fzjb: pssn * hfmp
+htjg: shzr * fpbs
+fdvq: wfnj * jmsb
+jhrd: srzr + hqbd
+sgqc: spjr - bqds
+nsmt: fbnq + ldgf
+fscw: vfdp - mtjt
+jnjh: dhhr / mfcb
+mnjm: sgqc * fgdl
+lgpl: 2
+phhh: 3
+jjsm: rflb + vzqp
+lbjs: 4
+sdgj: djwb + mncd
+wzzb: 2
+hswr: nvhf * mfrv
+wqft: 3
+grbd: 2
+czgp: 5
+srln: dnds / wfln
+nhpp: cdlz * btjd
+sgqw: 5
+bdsr: 3
+hwdq: 5
+qdfl: 4
+pqzw: 2
+zmzz: zftm + tcns
+cwlv: hwdm + rnww
+zsgl: 15
+zcwp: mbzq * ghvr
+znch: cmdc * jffl
+hdjm: 2
+rqnf: 2
+rbrt: 2
+shgz: hvwv * wtfp
+nlnh: pmlv + pqbs
+zrbs: vmgh * qstv
+fqlw: 12
+wgvv: 12
+qchc: bfjm + fdcb
+mqhs: 3
+wzbf: pgnb + tnrb
+sprd: 20
+bnmw: ggmg + nmbs
+tzvt: wvwq * flzt
+vmtn: bdwn * ghhp
+gzwf: 7
+jmcr: gsll + fhtb
+cfpc: jgtg * qbgs
+dswv: 3
+pqgp: qltn * qsmm
+fdwc: 11
+dvnq: tnmf * fgdj
+jzln: smtq + crpf
+cbnw: djfd + whps
+zftm: rqrc + jrhr
+pfvl: 3
+rsqh: 9
+qjnn: 2
+njlh: gfjt * ngdt
+nmnb: 2
+ggln: bpfp + nnwf
+wsqn: 5
+btbz: jsvf * dlqj
+qdfv: jpvq * chvd
+fwvr: fbcr + cvzz
+wzzh: 2
+lppp: 7
+fltg: cmsb * zfqj
+hpbm: dfsz + hsjd
+jwvn: 2
+pwrq: 3
+pstd: 5
+hhfl: 3
+zgbn: 2
+nfvl: 3
+dzlb: 3
+lwmv: 4
+bczr: zcdw * lhhn
+ctqd: fcdp + lvpn
+grvm: 4
+bcwc: 4
+fmsl: 3
+lqnd: 8
+jbbg: mwcv * gbvg
+pjlz: trrw * dlgb
+jgtg: 11
+tmjj: jvnc * slnn
+zcfc: 17
+ncrr: 2
+prrv: 2
+drln: 2
+zvbb: 2
+lqqm: 8
+rgtq: 2
+cbzq: 4
+bfnt: dngt * gcnf
+nfrh: ptbd * dqdg
+wrql: 19
+cgfz: 3
+mvtb: 2
+dsvj: 17
+bbqp: 11
+srdf: qdfl + jgtd
+pwwv: 2
+vdql: 6
+zsgs: 4
+qbvm: 2
+qznh: 19
+pdps: 16
+nsjq: hnvh + hzpq
+psrb: qwrr + jssl
+hvwz: 7
+fhtz: 5
+sdqh: ntvd * tsnj
+lvrt: 16
+zhwg: 2
+wmcn: 1
+vmdd: vmtf - fcvb
+pwwj: 4
+cqpz: 13
+hhnw: 5
+mncd: 6
+vzvq: qwrm * rjsf
+vggd: mrtc * dfnw
+cpgd: 2
+wfzb: pllp * gwvn
+rhbn: qwjn * dtgc
+hjzt: pspj + tsws
+dlbc: 2
+nhqc: gtqj + lthp
+lgrj: rcbw + rdql
+wjhd: 2
+sblh: 2
+sqsq: npns + mmls
+jlmv: 8
+spbh: wgdg - jrdz
+lzjv: 4
+zvqb: btgw / cdnh
+zsll: 5
+pvfw: fwhz / vqps
+tfjc: 2
+bnfc: 5
+sbzc: 5
+mnqr: 2
+fchm: 3
+vvnq: jtqm * cnhs
+ljnf: 18
+ztth: 3
+rddg: fggl / gqtm
+wdww: ztmd + hpbz
+pvgl: 2
+ljcf: 2
+gnmt: 2
+zphw: 3
+tnnq: 5
+qqww: 6
+jgtd: 3
+wjjw: 2
+vhzq: fzmz + fpqz
+gncw: lwzq + bbqp
+ntjt: 1
+mzvl: wwvq * ffcm
+nlmc: 3
+ptdh: nbsz + whhs
+nqqj: 2
+tdfg: lzct * dvrq
+vwdd: 5
+rjjp: bdlm / qtbl
+cwbp: 3
+mqnl: 2
+hdhf: sfhw - zgqb
+hhpw: wwqg * nstf
+rspb: 8
+hlrd: qmnw * dgcf
+nbnn: 1
+lfzj: wvpr + dcgf
+hpwd: hchv - dzct
+vqvc: 2
+vwjw: jpjh * rqjm
+ggmg: hsjv + dvnq
+mqhz: 2
+hrsc: 3
+dhqp: mvdj * ptqd
+wdqs: mfmg + fnrp
+twmt: bvpn - qjfm
+zjsg: vrmq * mqwh
+mwzp: 5
+jdvv: wjwj - wgsg
+hrsb: ctqd * tlfc
+njsq: 7
+lwzq: 4
+vdsp: lwnl + dqbf
+lnsg: qwvg - jhfj
+glzw: 5
+lbvg: 3
+fjsj: 3
+qlnd: cjbl / ntfl
+cnch: jvms + wvzw
+szmm: 2
+hhcb: lqvn + pclq
+cdvh: 2
+nhpb: 5
+lnwp: 4
+gdvc: fffh + qtch
+nzjr: bsbh / cpjq
+nchc: 4
+hhmm: 5
+jjgb: 5
+njts: mdsg * tmhv
+fgtp: 1
+hjcb: rgtq * bvcl
+mjfv: 17
+hnvh: nfvs + cqzf
+jqjt: 4
+vbhj: pprq * qcht
+lmjv: vnwf * zlfg
+zqwb: 7
+jmmb: hpbm - znzr
+cmnj: 7
+tljf: grqw * ltmw
+hhzt: fjvc + fjbd
+rpds: bnrz * ztlt
+zggl: ptdw * brzv
+swnn: 2
+pdzh: 10
+ctzd: wmsm + llcm
+bdwl: jghw + wrzb
+wqzr: 16
+vnzj: 3
+rvtm: 5
+nnth: smlw / jwvn
+wjwj: qwgr - btzm
+glsz: grlp + sprd
+jgwc: 4
+lqvh: jvgm + cpzt
+wdsc: 19
+hfnp: 5
+lstb: 5
+wcvp: 16
+sqml: rzvs * crqf
+vfgh: nvzz * hwdq
+hlns: 4
+rjpg: chvl / rpjh
+cwcl: mwht + zsbl
+dbjr: 2
+gchb: dvvw + ltfz
+smzb: 7
+gpff: mhts * zjpt
+nhfh: nmnl * jhlq
+qsjz: jnbr / vdql
+chfw: 6
+dlld: cwnw + nsms
+fzmg: ddzz - nqvg
+qdjv: rtlz + trzz
+cjpq: 1
+dsfr: 3
+nzmm: zjsg + mvwp
+mhts: 3
+tlst: 14
+htzl: 6
+lfvr: vgbp + ztzs
+qhpz: vqzf + mtbt
+rsvm: jdnm / qbgh
+rctz: nlff - tmtt
+sqsp: nhlz + bnps
+pmrw: jhqw * cqjr
+cprz: gqcz * czqr
+dbrn: bjps + cglv
+pvdv: ghhh + dthw
+dwqh: zrjt * ljhb
+vfpl: 2
+pgzc: 5
+bctn: 10
+ltpn: 2
+zhlv: pgzc * cdhq
+nrtv: rpds / dpgd
+mbml: 3
+jjbg: wcwf * hnqd
+pspj: zwvq * zgcd
+lfvh: lztb + mcwn
+lhjg: rhqb * vzgn
+flpq: sqsp + hlsw
+vwmc: 3
+ldpb: fqdv * btfv
+qljf: vsqz * fqbq
+qqtb: 2
+fzzc: bjft * wqft
+hhzz: zrbr * swgr
+lnhs: wmqg * lnsg
+qhrw: nbbd + wdww
+btfh: ddld / hnwb
+cftm: vltg + pvbv
+vggb: 5
+gtfh: qlws + hswr
+ngmt: 2
+rnnw: 3
+rrzf: 3
+hsjd: 5
+ztwp: 7
+lgqj: 2
+tdlb: 5
+hngp: pbcl - rdvw
+jqwc: 2
+cjpm: 2
+trnv: fzmq - nnrg
+qvjr: 4
+tgwq: wtzb * bdwl
+gmnm: bgrf * mhjh
+jflt: 20
+clpr: 1
+mffv: 3
+twbf: zmcp * mcgf
+gltg: 2
+twlj: wzzh * tbgb
+clnc: lnwt * rjfg
+chpw: gvps - zqnh
+ncqs: 3
+wjrc: 2
+vgwz: bttm * srmr
+dnlp: 3
+zrhf: 17
+ggsd: bsfb + sjmn
+sblg: zmdz * fwcg
+qmnw: nccc * lnwp
+rjqn: zjtw * zbqq
+qwns: 4
+tjwr: 7
+msqj: dfqj + frjv
+dbgf: zfgr + tdnc
+crtd: 3
+wvdf: 2
+gcrm: zvsp + lmbb
+drcm: zlfw / lgpl
+ggjc: rhfq * nnth
+gspp: 3
+vlss: vlfj + ntnh
+lmtj: 2
+hvrt: 2
+fwwc: 3
+gjqs: spbp + sjdf
+sgsq: 7
+gjjr: 5
+spbp: jwzv + jqwp
+lmdt: 5
+drht: gzsf - lrjw
+tppd: 1
+ghqm: mdvm + qmfh
+nvhq: qnqn * shmr
+vzgn: 3
+rhdw: 5
+fgjg: 2
+pcst: vvvd + ghzz
+mzsl: 5
+qgqm: 5
+clhs: 1
+nbvq: 3
+zdth: 12
+nmbs: pgsd * btlj
+pqgg: 16
+hbmn: 5
+wqzs: 13
+mdsg: 5
+gwvn: gfdm + mqfc
+gssj: phbz * hgfb
+bpbg: 3
+tgnd: 3
+vfzb: zphw * gzvj
+npgg: rmtg - tfds
+scjq: nzlc + lfgz
+bhwn: vhzc + pjzp
+hcjb: rcwt + tcvf
+hmvz: vgrl + snld
+lmlr: rhjp + jdjj
+cvgg: 7
+vzqp: 3
+szhw: 16
+fdvt: 2
+tnqh: gfrr * hbmn
+qzrb: dlhf + rlhb
+jnfm: tbpn + wzbf
+qfzn: scjn + fnjd
+rrss: 4
+wwns: ntgv / dljq
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+qlqp: rmbp + mjjz
+blgq: 2
+zbgj: ggvz / twjp
+vqft: zcwp + wmcv
+vnvt: vffm + hpzr
+fzmz: 4
+lmbb: psgp * jnpv
+vffm: 2
+mnpm: 2
+bqcz: 3
+znbp: 6
+fglh: djrd * rddz
+srzb: 2
+qtmq: 11
+wjmn: 2
+ghhp: 3
+vfdp: nlnh / pstd
+cdns: jmbb * nwbd
+cdqr: qvfn * trnv
+lfgz: 8
+gftm: mtzv * bnrw
+dmjj: tdgg - cdgb
+mltb: rjpg * whlw
+qbgs: 3
+rhhw: 2
+sqgq: 3
+zfrf: hwzm + vdqw
+gnbt: 3
+hbrt: 7
+gshr: bpgc + vsgp
+dtgc: zrdm + rqsq
+vpps: 6
+ngch: 2
+hwjf: 4
+ltwl: 3
+mwcv: rjqb - tjfg
+zfgr: 15
+zwtr: 2
+qlll: 4
+qscs: 11
+dmzf: ndgq * jtlq
+cqmq: wbvl * fvzj
+gjbw: jwtr * gfsz
+dvvw: 3
+plwf: jjpc - gvtz
+jpvq: 4
+dfhf: 3
+cqzf: 17
+tdst: hpdt + mgzr
+nnvm: jrjt + rwpt
+vdsz: bsjq + snhl
+nstf: vnpz - lqjd
+ldgn: 2
+fbrm: 2
+dcwb: htzg * cpls
+ppzg: 7
+fpqz: 3
+vvzh: vjdw * thwr
+nzdj: 5
+prnl: 2
+zfpz: hlgn * nrpv
+nwzg: bwwn + ngcl
+tvnz: 8
+bhmf: qhhc + ctrj
+wclb: 2
+qghp: ndzt * rcsd
+phqn: 10
+jqfp: 16
+nrbd: bmww + mhdj
+gnwd: 8
+tbgb: 3
+hltz: 2
+spfb: 6
+ntfl: 2
+ggjq: 2
+gjrh: 3
+jgdm: 3
+cgqf: 5
+qqgw: lfrc + bfnl
+vqww: 4
+pfbw: jzdb * qlll
+rnww: 3
+zsjf: 2
+bfcf: gtnb * mvqh
+bgpq: 3
+zpdj: 2
+gwrv: vbhj * lvdw
+rtdp: 3
+zdgh: 4
+lvdw: ldbb * gtbb
+btmb: pwhn + qbmw
+lztb: 1
+jqdc: 4
+zhrf: 5
+gbsh: 5
+qgcr: fpwc + qvng
+mzfb: 4
+pbdt: blcr * jrgc
+nhlw: 5
+wrjg: 2
+nnmf: 4
+czrg: 2
+bsbh: qgqm * dlzr
+bcwt: cjtb + fmqs
+ffjh: cdbc * mtvt
+cncq: 17
+cvfp: 1
+lscj: fgjj + jnfm
+mthr: 4
+crld: hjpm * bhdl
+lmrg: 3
+ggbm: wvmh + qvjr
+jqvj: qnsd + pccn
+hzsz: fsqs - hcsb
+btns: snsl / ltcj
+hbpc: 4
+fqdv: 7
+nsms: znbw * hjtg
+ccdh: gwsb * sbzc
+znzr: 2
+pcdc: jjrg * jjmz
+cqjr: 9
+jtdj: 2
+bmbf: ggsd * pfvl
+wmqg: 4
+jpsf: hhht / wnwr
+tlfc: 3
+fgdj: 2
+gqtj: 3
+gdrq: gssj / njww
+hwfc: 2
+cmsc: 2
+cpzt: chcn - nrbd
+snvr: 15
+tlwv: 20
+fwhl: dlcl * pnpf
+rppj: cbnw * hmtv
+ftft: 10
+tgzw: 2
+cjlp: rmrq + pwzz
+tjts: rnmb * ppzg
+lmms: ndtw + qgnl
+bdtv: znmw + pqgw
+jcrq: 7
+mcgf: 2
+nfnq: dvmz * zrqn
+phmc: 1
+drgm: vpqh * lrzq
+jrbs: hchc + cpvb
+qwwd: mnsg + zmsm
+qwcb: 2
+bccn: vmtn * fjhb
+ctrj: 4
+bpfb: 6
+nbwr: jrzh / nsrb
+pznf: 3
+qsrb: lstb * dzhn
+lrgw: ntht * ncjt
+qvdj: zbvt - cjpq
+lfpt: 16
+dwnm: drcm * hbjp
+sqfn: hwjz - lrlg
+ftpd: 5
+fzmq: wzpn * nmbf
+mzgs: jjbz * clpj
+zszj: 2
+drjw: 3
+jwjz: 8
+bhzz: 20
+bdpf: rnmv + jdft
+wfvq: 2
+tspr: lqnd * rptl
+nzlm: 2
+zjsh: vppd + pfsc
+tcvf: bpfb + dcvd
+vwnt: sgjn + ghcp
+wgdg: flnw / rztl
+wdrp: 3
+qjwg: jhrd / wsln
+crhd: cfrn + dpjz
+gdrp: nzns - gtbg
+rctv: hjcb + fzmf
+lptv: 2
+vmsl: nfqq * vzvq
+ggqq: 5
+wdcc: qpst * qrmf
+znmw: jdgf + dghn
+blcr: 4
+ztml: hfjw - bfdw
+djwb: 4
+qljv: 3
+lcsb: jfgd * jwcl
+wmsm: 16
+lstt: 4
+vvzd: jrbs + bjcm
+mqzj: rpwb * lvfn
+ssjp: zdpj + dbqz
+cnls: zbbq + bfzv
+rqjm: 3
+zqmg: 2
+gdrl: qfzn + gssz
+rjpd: 2
+mjjz: 1
+jflr: zbgj * zfbp
+ttvq: 9
+blgw: cdqj * fhwv
+zfqj: cncq * gqcr
+lmgd: wzmc * nmgc
+qmlq: zbvc / bvgd
+gfqf: 8
+lndg: ntrn + gchb
+zbrw: stqg + vvnq
+shzr: 2
+phqc: 5
+vplf: 6
+rlpl: gncw + rnqp
+qgjv: 9
+rnbq: bwcw * ffmc
+nljr: nwzg * gcdm
+qfpq: 2
+vdqw: dcbs + cjrp
+dsjp: tfvh * jqjt
+mhdj: ztqj - mjms
+vpft: 17
+zwvq: gmnm - thjc
+vpzc: 5
+sjmn: qppr * mnqr
+cnbw: 10
+jqwp: mdvv * rpbv
+zdpn: bcmv * nmvl
+rhdd: 5
+dzth: pcmn + ctvz
+phgs: cdvh * tzpz
+dnzs: jtdw + zqwr
+sqlf: 19
+vqhb: tlst / hvdd
+wvgz: 4
+fffh: jnmt + hlsh
+tgwj: 2
+jrjt: bbvj * hwwc
+ftbg: 14
+rlnp: 4
+grmt: 3
+znbw: jqgc * ttfg
+qqgj: qjcj * rtdh
+prmc: rnjz * hwtn
+pcmv: 2
+gdpp: 1
+hbcp: 5
+jgdz: pjlz / tchw
+fcvv: 3
+smst: 8
+nhzb: rmjf * dthv
+mnwr: 5
+jtwt: lfnr + jgdm
+jghq: bwdb * mfrb
+zqhg: 11
+nshp: 2
+pqgw: bphs + phzb
+gfnw: 2
+qtcj: 2
+dzbs: zzfd * shnd
+vgmc: rsqh * jnjh
+wjns: rjdv + tlfv
+rgct: phhh * wgqb
+szmt: jfqn * bwrd
+hdqt: 5
+wfjj: 6
+vjsd: nwpc + pntb
+vcqh: sctr / bnfc
+fbtp: 2
+mvbr: 5
+sctr: rvsd * thrd
+mfrv: 4
+hlbh: 13
+qgpp: 7
+rsdg: pqbr / wdmq
+gtgs: qthb / tljh
+gfgz: 14
+hzcl: 4
+mjtq: brmb + lstt
+mmgv: jtnf - nmrr
+zwcs: 7
+hghl: 2
+nvgb: 5
+dlfr: rtdp * ntgb
+jsvf: bnpz - mhfr
+qpgt: zrpq * dbsc
+bnfl: lsnr * bfnt
+vzbw: lrcz + dnzs
+jnsg: 1
+qsgc: ddsb - cvgg
+cdjs: zdng + gjmv
+zjbh: jtnt - srjj
+bpgc: shhb + rmcr
+nhms: 11
+jjbz: 2
+nwcj: 3
+bwjh: 11
+sjdf: wgpb * pqph
+jmfq: 16
+ssfh: wmcn + qzjs
+zczj: qqwb * vnwq
+mvqh: 2
+tvss: 9
+ncjj: 5
+bcth: 2
+ztnh: 3
+mcvf: 2
+rrbq: 2
+nzzw: hrsb / vjvf
+svhg: 2
+hlsw: cmtb * lspf
+ljhb: 2
+rlhb: mmfh * nfnp
+ldlc: 3
+lrbh: 9
+vhsd: cdqr + htzm
+lzzt: 2
+hpfs: 3
+tmhv: 4
+qzlb: dqsl * lrbf
+vpvn: 1
+tvtb: hvgj * lndg
+zmnv: 17
+vdrh: 3
+cqhd: 2
+hrnp: gqhp / hhnw
+cgzn: gjfj * rsjh
+gcbr: 11
+lmnt: glpq * frnm
+rjfd: 10
+rgjq: 2
+tcbp: 2
+mgmt: lcsb - nmpm
+fdrs: 5
+mzwg: wvht + lqqm
+hwhg: 3
+ptdw: 4
+mrpn: 6
+gtvh: 2
+ljtb: 3
+vsnb: 2
+cvzz: 12
+gvbg: vnzw * jmbq
+pfdm: 5
+czts: 19
+dscj: hfwv * mwzp
+wphd: tzcw - wfzl
+dsbp: pbzg * lptv
+wtzb: 5
+jdnb: qlmv + ljdc
+pqbs: qhrw + lhrf
+lpvc: cnzj + qwwd
+rmcr: zdvc - srbd
+clbh: jmmb + zdjf
+dlvr: 2
+dlgl: pfjv * tgzw
+dnwb: 20
+nbbh: bmbf + wcvp
+spbb: fwlg * mwpd
+pvsn: 4
+dzct: 12
+brlh: jdvg + dzcv
+hhjr: vqhj / nrld
+pzzz: blsc * htvq
+vpqg: rqvh - rtlj
+tvlt: hlbh * vgwt
+hvgj: 5
+bgbl: qhth + pdzh
+rzvs: 2
+mmsv: 4
+wjlf: gpjt + slnm
+bjft: 8
+jttv: nvcg * phfv
+bjfb: drgm + dhng
+zflj: 1
+cjwd: 2
+fmvq: 3
+vzfm: 7
+vqhl: 2
+qwjn: 3
+nvzz: 2
+hfwv: lrch * cjwd
+mmwr: rjqn / jslp
+srjj: 9
+fwsl: nnvm + qmgs
+gjvm: 2
+gscl: 4
+hqhz: 16
+pzlm: 3
+lghp: bhzz * ttjz
+tprh: 5
+bpht: nfnq * lrtz
+rhpc: ghqf + nzlm
+dwrd: 3
+qwrm: 2
+ltcf: tvvv + fzrz
+jdgf: 4
+gftv: gdrq * qfpq
+nnzn: pcdv - gcjv
+nwmb: ldfr * pwbl
+vdpl: rlmn + hzrw
+rdzw: 2
+bwmf: 4
+gnjz: 1
+sgjn: 4
+jhfv: 4
+tbtp: jhfv * zmnc
+mdvm: 6
+fnjd: lmhr * zjbh
+pwzz: 11
+rmbz: 3
+qmfq: 2
+nnrf: 2
+tfgm: nzjr * rdzw
+mdvs: lbft * hpqc
+ggvz: wbmp * csjl
+jjws: 4
+hzrw: 2
+vfqc: 4
+lqvn: 3
+pdgb: 3
+pmjb: dtzf + fqjw
+lsbn: brhg * ppnz
+mtmt: bwmf + ljtb
+rszh: htzl + trmb
+qnqn: 5
+mtwg: 2
+mjgr: 15
+qbvs: hcpq + gdpp
+ngns: phmc + qmwh
+lsfg: 3
+clmp: 2
+mfrs: rddl * ntnn
+fcfj: sjtq * mjtf
+bqws: 3
+bsrc: 7
+wmcv: zcns + snnd
+ggsh: qhbd * ttfz
+tqzq: prrf * rvtm
+tzft: tvhj * ljtg
+tzpz: 17
+vqzf: fddg + tbtp
+gtqj: 1
+thrd: hdjm * gswt
+pnhw: mhsw + mjgr
+mzfq: jwjz + zngj
+jtnf: vpqg * pdtq
+wcqm: 4
+cwcc: vfqc * crlj
+fvfz: 2
+zgfg: 6
+lrcz: rjww + chgz
+zbhn: 3
+nrvz: cjpm * qlst
+ltfw: bqjb * rpwv
+msrh: mdnc + ndsl
+pllp: 2
+nmbf: 3
+gtsq: bhmf + dtfg
+tsjz: 1
+qwcd: hrpj * vjbf
+djsg: 3
+qrfl: lngb + zfpm
+nbsz: pqgg + dclr
+mrtc: pljt * sltm
+gcdm: 4
+znpj: bjjl + qtfn
+vgrl: sqsq * flhn
+ctpp: qtjv / cqhd
+fwgh: rplb * zqhg
+rbtv: wcml * sjgq
+fbnt: wwqt + mmln
+chvl: clbh * rjpd
+ntrn: 2
+bqmn: prnl * hszr
+pcth: gfqf * hnwf
+tfzs: 2
+qgvr: 2
+bnsw: dscj + pcdc
+vhnt: zqpc + vjsd
+qwvg: svpg * nngm
+qggg: htrz * hmtw
+bcqz: nqfj + wtzv
+gpvl: lbjs * qwns
+glpq: fdvt * czts
+tzrq: mzgb * bdsr
+htjj: rqcw / pmdg
+nmgg: 2
+ttpt: 19
+qjfm: lmvs * cncl
+hqnb: 4
+dljq: 3
+rsvb: gtvh + zglh
+zcwn: 2
+cgsf: gfdn + rndh
+wlfq: 13
+djth: 6
+pjwp: 17
+nmpm: 5
+jfbb: 1
+vppd: 2
+npbn: lhnz * dsfr
+wllt: 2
+tvvv: nhlc - jmcr
+zdfc: 4
+rhjt: 3
+tgfh: bfsz * dvjf
+fntf: qdlz + lhjg
+tggp: 13
+thwr: nbjt - mmwq
+shmr: 3
+djrd: 5
+mzhd: 3
+dhng: wbgn + gzwf
+pqph: 2
+mdwj: 3
+jpmg: qrvb * fvtp
+cdbc: 2
+whps: gjpc * bqmn
+hzmz: 5
+gwqp: bgqr + qgcr
+fnrp: hfbs + clsc
+scls: 2
+trlc: 9
+nhdt: rlnp + nbmm
+jqnj: 7
+mhjh: 4
+nhsm: jrtt * dnwb
+bpmp: cmjs / zjhg
+ghds: vpft * lmcp
+whjb: 5
+jqjr: bznb + djjs
+zlcj: fwvr + clhs
+wzmc: 4
+nhcj: 3
+lfqp: trpw + zcfd
+zqjz: 12
+bstz: wsgl + fqff
+dfft: psmj + pqst
+htgt: 5
+qgzm: 1
+wtfp: vhlg + cwqw
+gwsl: htnt * bzcn
+tbhz: 2
+bmvt: crhd * hhfl
+gfrh: 5
+qbvz: 2
+lzbt: 3
+gcjv: 5
+dcnz: dsvj - nhmc
+zhhb: 12
+ghzz: 5
+qsgr: pjgn + ffjp
+mrwq: qlpq / nlqn
+gbgz: 5
+gcfr: hfvs * vprp
+gqcr: 2
+bhdl: vggb * rsvv
+wdhv: 3
+lrwz: 5
+slft: 4
+ldnp: 8
+vqps: 3
+wgsg: bmtd * njjp
+dlqj: nmtq * nfbw
+cmdc: 4
+dtjc: 3
+wqzg: mqnl * vgjd
+gfjt: vgwz / wjrc
+djjp: pmfm + vvrw
+dfnw: srln + zvms
+lgqq: fhlf + tqgm
+cmnt: jhfc + dqhd
+lcrj: 5
+smlw: dfjg * sblh
+nstd: 3
+gbvg: 5
+vlhn: bbbt * ttrm
+nnrg: 4
+nzcc: 3
+rjzt: 17
+nnpm: dlld + wspn
+ggtb: 2
+bnhd: nbnn + tdlb
+jfhb: 10
+hpqc: 8
+cfjg: 2
+jdjd: sjfb + jbbg
+nvcg: gtsq + nlhg
+dczm: 2
+gwqz: 17
+lwzn: 3
+qgnv: 5
+fgzq: 2
+wspn: pvfw * svth
+jgrm: 3
+fvtp: 6
+qtfn: vzdj * wqzs
+ccqw: 4
+cvnr: gsrs + vdng
+ptnf: 10
+mcmr: wblz * gmhr
+btzm: pfjr * mrzl
+ntsm: tlwv + zfnn
+rccq: bqwc + qcwj
+fcvb: 5
+pcts: cpjd + zqph
+zcdw: jdnb + gwvc
+nqwn: nzdt * jwbw
+nwbd: 10
diff --git a/day21-scratch.lisp b/day21-scratch.lisp
new file mode 100644
index 0000000..dd71da8
--- /dev/null
+++ b/day21-scratch.lisp
@@ -0,0 +1,57 @@
+;; // https://adventofcode.com/2022/day/21
+;; well, this seems like this could be done with (eval)
+;; would it be possible for me to also translate
+;; xxx + yyy into (call xxx) + (call yyy)
+;; that would be neat
+
+(in-package :day-21)
+
+;; so. have mashmap from symbol name into operation
+;; and have (my-eval)?
+;; it will take symbol name, and either return number directly from the map
+;; or will wrap the names into my-eval and run operation on them?
+
+;; is there a way to have less code and reuse existing lisp things?
+;; if there's direct number, i could just run (defparameter lfqf 4)
+;; and then execute root directly, i think
+;; or what, i'd need to also define all the intermediate symbols,
+;; (setq a (+ c d)) ; complains that C is unbound
+;; how could this be a lazy eval?
+;; well. hm
+;; i could define all of these as macroses?
+(defmacro *test-monkey-hmdt* () 32)
+(+ 3 (*test-monkey-hmdt*))
+
+;; yup, i guess
+
+(defparameter *test-monkey-sllz* 4)
+(eval *test-monkey-sllz*)
+(defparameter *test-monkey-ljgn* 2)
+(defparameter *my-operation* '(+ *test-monkey-sllz* *test-monkey-ljgn*))
+*my-operation*
+(eval *my-operation*)                   ; well, that works ok
+;; so, read all of these things as parameters.
+
+;; "root: pppw + sjmn "
+
+(mapcar #'intern (ppcre:split " " "root: pppw + sjmn "))
+(mapcar #'parse-integer-or-symbol (ppcre:split " " "root: 44"))
+
+(ppcre:regex-replace ":" "root: pppw + sjmn " "")
+
+(line-to-quoted-operation "root: pppw + sjmn")
+(eval (line-to-quoted-operation "dbpl: 5"))
+
+;; well, i'd want to put quoted expression into parameter?
+;; and now i can remove quoting of the defparameter?
+;; and actually define all of the parameters?
+
+(loop
+  for line in (uiop:read-file-lines "day21-test.txt")
+  for definition = (line-to-quoted-operation line)
+  do (eval definition))
+
+(eval root)
+
+(load-file-defs "day21-test.txt")
+(eval root)
diff --git a/day21-test.txt b/day21-test.txt
new file mode 100644
index 0000000..e14be60
--- /dev/null
+++ b/day21-test.txt
@@ -0,0 +1,15 @@
+root: pppw + sjmn
+dbpl: 5
+cczh: sllz + lgvd
+zczc: 2
+ptdq: humn - dvpt
+dvpt: 3
+lfqf: 4
+humn: 5
+ljgn: 2
+sjmn: drzm * dbpl
+sllz: 4
+pppw: cczh / lfqf
+lgvd: ljgn * ptdq
+drzm: hmdt - zczc
+hmdt: 32
diff --git a/day21.lisp b/day21.lisp
new file mode 100644
index 0000000..f653d35
--- /dev/null
+++ b/day21.lisp
@@ -0,0 +1,35 @@
+;; // https://adventofcode.com/2022/day/21
+(defpackage :day-21
+  (:use :cl))
+(in-package :day-21)
+
+(ql:quickload 'cl-ppcre)
+
+(defun parse-integer-or-symbol (str)
+  (let ((maybe-int (parse-integer str :junk-allowed t)))
+    (if maybe-int
+        maybe-int
+        (intern (string-upcase str)))))
+
+
+(defun line-to-quoted-operation (line)
+  (let* ((words (ppcre:split " " (ppcre:regex-replace ":" line "")))
+         (symbols (mapcar #'parse-integer-or-symbol words)))
+    (cond
+      ((= 4 (length symbols))
+       ;; with operation
+       (destructuring-bind (name operand1 op operand2)
+           symbols
+         `(defparameter ,name '(,op (eval ,operand1) (eval ,operand2)))))
+
+      ((= 2 (length symbols))
+       ;; just number
+       (destructuring-bind (name value)
+           symbols
+         `(defparameter ,name ,value))))))
+
+(defun load-file-defs (filename)
+  (loop
+  for line in (uiop:read-file-lines filename)
+  for definition = (line-to-quoted-operation line)
+  do (eval definition)))