diff --git a/day20-input.txt b/day20-input.txt
new file mode 100644
index 0000000..cd07c18
--- /dev/null
+++ b/day20-input.txt
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+3971
+-8228
+-2847
+-7457
+-3983
+9115
+9911
+8444
diff --git a/day20-scratch.lisp b/day20-scratch.lisp
new file mode 100644
index 0000000..64af866
--- /dev/null
+++ b/day20-scratch.lisp
@@ -0,0 +1,241 @@
+;; https://adventofcode.com/2022/day/20
+
+(in-package :day-20)
+
+;; so. how would i do moves in a list?
+;; and are there duplicate numbers?
+;; it's possible but not sure.
+;; also in the input numbers are 4k 5k.
+;; i guess on during the moving it would be best to figure out their index?
+;; could i insert into list at index?
+;; it could be nice to use just cycled list. but.
+;; maybe use array?
+
+'(1 2 -3 3 -2 0 4)
+;; calculating index and then modifying array. is it easy to do shifts on array?
+;; and i'd sometimes need to
+;; and how multiple passes work with going over self?
+;; let's take a break
+;; i guess i could copy part of array with the offset arrays
+;;
+;; the stupid version seems to be 4 cases :
+;; - to right inside of array
+;; - to right over with overflow
+;; - to left inside of array
+;; - to left over with overflow
+;; but when overflow - could stop to the left or to the right of self.
+
+(defparameter *my-arr*
+  (aops:linspace 0 9 10))
+
+;; imagine i'm displacing 345 by 1 to right
+;; ( that would mean 6 moving 3 to the left)
+(setq *my-arr* (aops:linspace 0 9 10))
+(let ((to-be-moved (make-array 3  :displaced-to *my-arr* :displaced-index-offset 3))
+      (into-these-move (make-array 3  :displaced-to *my-arr* :displaced-index-offset 4)))
+  (loop
+    for i from 2 downto 0
+    do (setf (aref into-these-move i) (aref to-be-moved i))))
+
+*my-arr*
+
+;; now displacing 345 by 1 to left
+(setq *my-arr* (aops:linspace 0 9 10))
+(let ((to-be-moved (make-array 3  :displaced-to *my-arr* :displaced-index-offset 3))
+      (into-these-move (make-array 3  :displaced-to *my-arr* :displaced-index-offset 2)))
+  (loop
+    for i from 0 below 3
+    do (setf (aref into-these-move i) (aref to-be-moved i))))
+*my-arr*
+
+;; now let's also remember "moved" element and put it to the "freed up space"
+;; moving 6 by 3 to the left
+(setq *my-arr* (aops:linspace 0 9 10))
+(let* ((index-of-moved 6)
+       (moved-value (aref *my-arr* index-of-moved))
+       (move-by -3)
+       (to-be-moved (make-array 3  :displaced-to *my-arr*
+                                   :displaced-index-offset (+ index-of-moved move-by)))
+       (into-these-move (make-array 3  :displaced-to *my-arr*
+                                       :displaced-index-offset (+ index-of-moved move-by 1))))
+  (loop
+    for i from 2 downto 0
+    do (setf (aref into-these-move i) (aref to-be-moved i)))
+  (setf (aref *my-arr* (+ index-of-moved move-by)) moved-value))
+*my-arr*
+
+;; ok. but these 2 downto 0 || 0 to 2 dependent on -3 +3 and that's ugh
+
+
+
+;; moving 2 by 3 to the right (now displacing 345 by 1 to left)
+(setq *my-arr* (aops:linspace 0 9 10))
+(let* ((index-of-moved 2)
+       (moved-value (aref *my-arr* index-of-moved))
+       (move-by 3)
+       (to-be-moved (make-array 3  :displaced-to *my-arr*
+                                   :displaced-index-offset (+ index-of-moved 1)))
+       (into-these-move (make-array 3  :displaced-to *my-arr*
+                                       :displaced-index-offset index-of-moved)))
+  (loop
+    for i from 0 to 2
+    do (setf (aref into-these-move i) (aref to-be-moved i)))
+  (setf (aref *my-arr* (+ index-of-moved move-by)) moved-value))
+*my-arr*
+
+;; so also difference in displaced indexes.
+;; shift to LEFT (move item left):
+;;
+;; shift to RIGHT (move item right):
+
+;; well, i could just save this code as two separate functions
+;; would be nice to immediately start doing the repeatable tests
+
+(move-item-to-left (aops:linspace 0 9 10) 6 6)
+
+;; and a separate function for swithing to the right?
+
+(move-item-to-right (aops:linspace 0 9 10) 6 1)
+(move-item-to-right (aops:linspace 0 9 10) 6 2)
+(move-item-to-right (aops:linspace 0 9 10) 6 3)
+
+;; next what? calculation of the target index through modulo
+'(1 2 3 4 5 6 7 8 9)
+;; if we're moving 2 by -2 how does that work?
+;; we have starting index 1, we have length 9.
+;; my guess is that take MOD by 9-1
+;; how many swaps to the right until the element returns to its original place?
+'(1 2 3 4 5 6 7 8 9)
+'(2 1 3 4 5 6 7 8 9)
+'(1 3 4 5 6 7 8 9 2)
+'(1 3 4 5 6 7 8 2 9)
+'(1 3 4 5 6 7 2 8 9)
+'(1 3 4 5 6 2 7 8 9)
+'(1 3 4 5 2 6 7 8 9)
+'(1 3 4 2 5 6 7 8 9)
+'(1 3 2 4 5 6 7 8 9)
+'(1 2 3 4 5 6 7 8 9)
+;; so, if moving by 9. hm
+
+;; then moving by 12 is 9 + 3
+(mod 9 3)
+(mod 10 3)
+(length (make-array 7))
+
+(move-item-to-left (aops:linspace 0 9 10) 6 9)
+
+;; ok, now join into one function that moves the element by it's value?
+
+(find 4 '(1 4 3 2 9))
+(position 4 '(1 4 3 2 9))
+
+(defparameter *test-array* (make-array 7 :initial-contents '(1 2 -3 3 -2 0 4)))
+*test-array*
+
+(move-elem-by-itself *test-array* -2)
+
+
+;; whelp. my movements are ugh.
+;; so. "i'd want additional move on top of my move-left and move-right"?
+(mod -1 3)
+
+(move-item *test-array* 3 3)
+(move-item *test-array* 3 4)
+
+(defparameter *test-array* (make-array 7 :initial-contents '(1 2 -3 3 -2 0 4)))
+*test-array*
+
+(move-elem-by-itself *test-array* -2)
+;; this seems to work.
+;; now back to the loop?
+
+(defparameter *test-array* (make-array 7 :initial-contents '(1 2 -3 3 -2 0 4)))
+(mixing-array *test-array*)
+;; after moving 2, arr: #(1 -3 2 3 -2 0 4)
+;; after moving -3, arr: #(1 2 3 -2 0 -3 4)
+;; -3 move wasn't correct
+
+(loop for elem across *test-array*
+      do (print elem))
+
+(defparameter *test-array* (make-array 7 :initial-contents '(1 -3 2 3 -2 0 4)))
+(move-elem-by-itself *test-array* -3)
+;; 0 -> 0
+;; -1 -> (len - 1)
+;; -2 -> (len - 2)
+(mod -1 7)
+;; so, just hack it? when we move to the left, we add one more?
+;; so, ugh and when moving to positive, but going over the what
+;; the number is not "switched" with the neighbor, it's jumping over the neighbor...
+;; so, if we go to 0 or to len-1 then we jump to the other side?
+
+(defparameter *test-array* (make-array 7 :initial-contents '(1 -3 3 -2 2 0 4)))
+(move-elem-by-itself *test-array* 2)
+
+(defparameter *test-array* (make-array 7 :initial-contents '(1 -3 3 -2 2 4 0)))
+(move-elem-by-itself *test-array* 4)
+
+(defparameter *test-array* (make-array 7 :initial-contents '(1 2 -3 0 3 4 -2)))
+(move-item *test-array* 5 4)
+(move-elem-by-itself *test-array* 4)
+
+;; now this incorrect:
+;; after moving 3, arr: #(1 2 -2 -3 0 3 4)
+;; after moving -2, arr: #(-2 1 2 -3 0 3 4)
+;; -2 should have went instead of to 0 straight to the end. so
+;;
+
+;; and now it works
+;; god i also need to take 1000th value with overbound. ugh.
+(defun get-ugh-nth (arr n)
+  (let* ((zero-ind (position 0 arr))
+        (unsafe-index (+ zero-ind n))
+        (safe-n (mod unsafe-index (length arr))))
+    (aref arr safe-n)))
+
+(get-ugh-nth (mixing-array *test-array*) 1000)
+(get-ugh-nth (mixing-array *test-array*) 2000)
+(get-ugh-nth (mixing-array *test-array*) 3000)
+;; uh. after the value 0...
+;; so first find index of 0
+
+(let* ((nums (mapcar #'parse-integer (uiop:read-file-lines "day20-input.txt")))
+      (input-arr (make-array (length nums) :initial-contents nums))
+      (mixed (mixing-array input-arr)))
+  (+ (get-ugh-nth (mixing-array mixed) 1000)
+     (get-ugh-nth (mixing-array mixed) 2000)
+     (get-ugh-nth (mixing-array mixed) 3000)))
+;; 1797 is too low,
+
+(defun part-1-ans (filename)
+  (let* ((nums (mapcar #'parse-integer (uiop:read-file-lines filename)))
+      (input-arr (make-array (length nums) :initial-contents nums))
+      (mixed (mixing-array input-arr)))
+  (+ (get-ugh-nth (mixing-array mixed) 1000)
+     (get-ugh-nth (mixing-array mixed) 2000)
+     (get-ugh-nth (mixing-array mixed) 3000))))
+
+(part-1-ans "day20-test.txt")
+(part-1-ans "day20-input.txt")
+
+;; well, do we have duplicates?
+
+(ql:quickload :fset)
+(fset:set 1 2 3)
+(fset:set '(1 2 3))
+(print (let* ((nums (mapcar #'parse-integer (uiop:read-file-lines "day20-input.txt")))
+              (input-arr (make-array (length nums) :initial-contents nums))
+              (input-set (fset:convert 'fset:set nums))
+              )
+         (list 'arr (length input-arr) 'set (fset:size input-set))
+         ))
+;; (ARR 5000 SET 3613)
+;; well, yupikayey
+;; how should i be doint that?
+;; AND i should have checked that from the start.
+;; so. there are duplicates.
+
+(fset:convert 'fset:bag '(1 2 3 2 4 5))
+;; what should i do about the duplicates?
+;; i'd need to store elements with their initial indexes i suppose
+;; and then what? iterate not over initial collection, but just over "initial" indexes
diff --git a/day20-test.txt b/day20-test.txt
new file mode 100644
index 0000000..52c68ff
--- /dev/null
+++ b/day20-test.txt
@@ -0,0 +1,7 @@
+1
+2
+-3
+3
+-2
+0
+4
diff --git a/day20.lisp b/day20.lisp
new file mode 100644
index 0000000..eef460e
--- /dev/null
+++ b/day20.lisp
@@ -0,0 +1,112 @@
+;; https://adventofcode.com/2022/day/20
+
+(defpackage :day-20
+  (:use :cl))
+(in-package :day-20)
+
+(ql:quickload :array-operations)
+(ql:quickload "fiveam")
+(ql:quickload 'alexandria)
+
+(5am:def-suite day20-tests)
+
+;; and shift some slice 1 to right
+(defun move-item-to-left (array moved-index move-size)
+  (declare (optimize (debug 3)))
+  (let* ((move-size (mod move-size (1- (length array))))
+         (moved-value (aref array moved-index))
+         (move-by (- (mod move-size (length array))))
+         (moving-slice-size move-size)
+         (to-be-moved (make-array moving-slice-size  :displaced-to array
+                                                     :displaced-index-offset (+ moved-index move-by)))
+         (into-these-move (make-array moving-slice-size  :displaced-to array
+                                                         :displaced-index-offset (+ moved-index move-by 1))))
+    (loop
+      for i from (1- move-size) downto 0
+      do (setf (aref into-these-move i)
+               (aref to-be-moved i)))
+    (setf (aref array (+ moved-index move-by)) moved-value)
+    array))
+
+(5am:def-test move-left-inside-of-array (:suite day20-tests)
+  (5am:is (equalp (make-array 10 :initial-contents '(0 1 2 6 3 4 5 7 8 9))
+                 (move-item-to-left (aops:linspace 0 9 10) 6 3))))
+(5am:def-test move-left-to-edge (:suite day20-tests)
+  (5am:is (equalp (make-array 10 :initial-contents '(6 0 1 2 3 4 5 7 8 9))
+                 (move-item-to-left (aops:linspace 0 9 10) 6 6))))
+(5am:def-test move-by-arr-size-leaves-intact (:suite day20-tests)
+  (5am:is (equalp (make-array 10 :initial-contents '(0 1 2 3 4 5 6 7 8 9))
+                 (move-item-to-left (aops:linspace 0 9 10) 6 9))))
+(5am:def-test move-by-more-than-arr-size (:suite day20-tests)
+  (5am:is (equalp (make-array 10 :initial-contents '(0 1 2 6 3 4 5 7 8 9))
+                 (move-item-to-left (aops:linspace 0 9 10) 6 12))))
+
+(defun move-item-to-right (array moved-index move-by)
+  (declare (optimize (debug 3)))
+  (let* ((move-by (mod move-by (1- (length array))))
+         (moved-value (aref array moved-index))
+         (moving-slice-size move-by)
+         (to-be-moved (make-array moving-slice-size
+                                  :displaced-to array
+                                  :displaced-index-offset (+ moved-index 1)))
+         (into-these-move (make-array moving-slice-size
+                                      :displaced-to array
+                                      :displaced-index-offset moved-index)))
+    (loop
+      for i from 0 below move-by
+      do (setf (aref into-these-move i)
+               (aref to-be-moved i)))
+    (setf (aref array (+ moved-index move-by)) moved-value)
+    array))
+
+(5am:def-test move-right-inside-of-array (:suite day20-tests)
+  (5am:is (equalp (make-array 10 :initial-contents '(0 1 2 3 4 5 7 6 8 9))
+                  (move-item-to-right (aops:linspace 0 9 10) 6 1))))
+(5am:def-test move-right-to-edge (:suite day20-tests)
+  (5am:is (equalp (make-array 10 :initial-contents '(0 1 2 3 4 5 7 8 9 6))
+                  (move-item-to-right (aops:linspace 0 9 10) 6 3))))
+(5am:def-test move-right-by-arr-size-leaves-intact (:suite day20-tests)
+  (5am:is (equalp (make-array 10 :initial-contents '(0 1 2 3 4 5 6 7 8 9))
+                 (move-item-to-right (aops:linspace 0 9 10) 6 9))))
+(5am:def-test move-right-by-more-than-arr-size (:suite day20-tests)
+  (5am:is (equalp (make-array 10 :initial-contents '(0 1 2 3 4 5 7 8 9 6))
+                 (move-item-to-right (aops:linspace 0 9 10) 6 12))))
+
+(defun move-item (array move-index move-by)
+  (let* ((raw-target-index (if (>= move-by 0)
+                               (+ move-index move-by)
+                               (+ move-index move-by)))
+         (in-array-target-index (mod raw-target-index (1- (length array))))
+         (in-array-target-index (if (= 0 in-array-target-index)
+                                    (1- (length array))
+                                    in-array-target-index ; a hack
+                                    ))
+         (safe-move-by (- in-array-target-index move-index)))
+    ;; (list move-index move-by
+    ;;       'raw-target raw-target-index
+    ;;       'in-array-target in-array-target-index
+    ;;       'safe-move-by safe-move-by)
+    (if (> safe-move-by 0)
+        (move-item-to-right array move-index safe-move-by)
+        (move-item-to-left array move-index (- safe-move-by)))
+    ))
+
+;; we know the element value, but not it's place
+(defun move-elem-by-itself (array element)
+  (declare (optimize (debug 3)))
+  (let ((i (position element array)))
+    (move-item array i element)))
+
+(defun mixing-array (arr)
+  (let ((to-be-modified (alexandria:copy-array arr)))
+    (loop
+      for elem across arr
+      do (progn (move-elem-by-itself to-be-modified elem)
+                (format t "after moving ~a, arr: ~a~%" elem to-be-modified)
+                ))
+    to-be-modified))
+
+
+
+
+(5am:run! 'day20-tests)