Test # 63
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1500 questions in 150 tests. Each test contains 10 questions.
Idiom of the Day
take care of (something)
to deal with something, to do what is necessary to accomplish something
"Could you please take care of these letters while I make some phone calls."
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Twists and Flips
A corner at a certain place can have three states. Algorithms that take a corner from one state to another twists a corner. For pratical reasons, twisting is considered undefined when a corner does not stay at the same place. Mathematically, twisting can still be defined, but only in a less intuitive way of little concern to us.
When viewed from the exterior toward the corner, a clockwise twist of 120