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cathyangs
TongTong is doodling in class and draws a 3 3 grid. She then decides to color some (that is, at least one) ofthe squares blue, such that no two 1 1 squares that share an edge or a corner are both colored blue. In how many ways may TongTong color some of the squares blue? TongTong cannot rotate or reflect the board. Could someone please explain how to solve this?