Wanna know how to solve this puzzle? I'll sell you a hint for a buck! I'll even show you the coords for twelve bucks! It has to be all ones or all twos. Fives or tens will not work. Only combos of ones and twos will do! Anyway, here's the puzzle.
Philadelphia
St. Louis
Dallas
Boston
New York
Minneapolis
San Fransisco
Boston
Cleveland
St. Louis
Philadelphia
Chicago
Atlanta
You can validate your puzzle solution with certitude.