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what is "boundary"?

Posted by zengkui at 2007-03-04 14:49:09 on Problem 3207 
"Now liympanda tells Ikki no two links touch inside/outside the circle, except on the boundary."

please tell me more about what the "boundary" refers to.
does it refers to the circle? Since each wire must be entirely inside or outside the circle, where could they touch each other?
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