It's hard to explain how this started -- there were three rows of green, red and blue screws, a set in three columns and a set in four columns. I asked Grace how she could make the two groups identical, and she said she could remove the right column from the set of four. I asked her to come up with another way, expecting her to remove the left column -- instead, she removed one green screw, one red screw, and one blue screw from each row as you see here. So cool. |
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