brainteaser

n.

难题，谜；

1. If you fill in squares correctly, options for the remaining ones are narrowed and it becomes easier to solve this brainteaser.
   如果你正确地填充了方框，剩余的选择范围会缩小同时解决这个难题也就越简单。

BRAINTEASER
Brainteaser
Brainteaser
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