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... ek left before the sailing entrance exam.
Shen Hou and Miao Miao spent almost all day in the coffee shop, except for reading and practicing exercises.
"…time up."
Miao Miao wailed, "It's over... I suspect that I may have made a fake test paper. What are these questions?"
If the six faces of a cube are painted with four different colors, and the colors of two adjacent faces are different, and the same set of colors is used for all the cubes, how many different ...
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