Reason: For example, in the first row, according to black+empty = black, align the first pattern and the second pattern (according to their positions in the 3*2 square); White+empty = white; White+white = black; White+black = empty method to get the third mode.

Example: In the first row and column of 2*3, there is a black ball and an empty ball, and black+empty = black, so the same position in the third pattern is a black ball.

I'm very serious, adopt one ~