Tricky Tripple

Last Level Complete.
Congratulations!
Tricky Triple: Click the squares to cycle through icons and put a square, circle, or triangle in every white square. When 3 adjacent white squares are in a line (horizontally, vertically, or diagonally) then exactly 2 of the squares must contain the same symbol. Grayed-out and black squares cannot be changed. A solved puzzle is shown below. Each puzzle has a unique solution. All puzzles were designed by Erich Friedman.

   

Complete source code can be found here.

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