Given the $x$-$y$ coordinates of the start and end points of line segment, draw another segment with a given length $L$ perpendicular to an endpoint of the first segment and determine the coordinate of its constructed endpoint.

Given the $x$-$y$ coordinates of the start and end points of line segment, draw another segment with a given length $L$ perpendicular to an endpoint of the first segment and determine the coordinate of its constructed endpoint.

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