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\draw[draw=blue]路let路\p1=($(P)-(O)$),路
\n1={atan(\y1/\x1)},路\p2=($(P)-(R)$),路\n2={atan(\y2/\x2)}路
in路($(P)!0.5cm!(R)$)路arc路(\n2:\n1:-.5);露
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Author: Anonymous User 323