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The black line traces a maze on the floor. It may have 90 degree turns in it, turns of other angles, or curves. The line will never cross itself.
黑线在地板上布置成迷宫状,整条轨迹线包含90度角的转弯,其它角度的转弯或是曲线,但不会出现线条交错现象。
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