this was a tough one (but all PACMAT problems are great fun!)
Get the area codes from a list of phone numbers
Knight's Tour Checker
Minimum Set (A+A)U(A*A) OEIS A263996
USC Spring 2013 ACM: Walking on Thin Ice
Minimum Distance between two N-sided Polygons
ICFP2021 Hole-In-Wall: Solve Problem 4, Score=0, Bonus GLOBALIST assumed
GJam 2014 China Rd B: Sudoku Checker
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