day25: initial graph stuff,

with cycles removal not working

day25/example-before-removing.mmd

@@ -0,0 +1,34 @@
+flowchart TD
+	lhk --- lsr
+	cmg --- lhk
+	frs --- lhk
+	frs --- qnr
+	jqt --- xhk
+	lsr --- rsh
+	jqt --- ntq
+	bvb --- xhk
+	hfx --- rhn
+	jqt --- rhn
+	lsr --- pzl
+	nvd --- pzl
+	ntq --- xhk
+	bvb --- ntq
+	cmg --- qnr
+	rhn --- xhk
+	rsh --- rzs
+	frs --- lsr
+	frs --- rsh
+	hfx --- xhk
+	hfx --- pzl
+	cmg --- nvd
+	lhk --- nvd
+	nvd --- qnr
+	jqt --- nvd
+	lsr --- rzs
+	qnr --- rzs
+	cmg --- rzs
+	hfx --- ntq
+	bvb --- hfx
+	bvb --- cmg
+	bvb --- rhn
+	pzl --- rsh