Tic-tac-toe is a game for two players who take turns marking spaces in a three-by-three grid with X or O. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row is the winner.
Source: Wikipedia
Build a tic-tac-toe game that is playable by two players.

If you aren't familiar with the game, try out playing tic-tac-toe on Google.
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