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Counting by position (sliding window)
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4-point ladder

Counting by position (sliding window), 4-point ladder

●●○4 points, difficulty 2 of 34 pt

Two steps, or one step plus a trap.

3 in a row to finish this ladder.

0/1 solved

KA-0046

about 75s

How many 2 by 2 squares fit on a 4 by 4 board, if they must line up with the grid?