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@@ -69,6 +69,9 @@ dictionary. This is faster for these reasons:
 If the dictionary wasn't sorted then this probably would've been slower
 than previous implementation.
 
+The =neighbors= subroutine (=lib/Octans/Neighbors.rakumod=) was taken from
+my AoC (Advent of Code) 2020's day-11 solution.
+
 ** Options
 *** dict
 Octans's default dictionary file is =/usr/share/dict/words=, use =--dict=