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Cut the curve outwith a scalpel, going along the curve (it is oriented), rotate it bythe right side 360 degrees against the orientation, and glue it back in...
Cut the curve out, rotate it by 360 degrees against the orientation, and glue it back in...
Cut the curve with a scalpel, going along the curve (it is oriented), rotate the right side 360 degrees, and glue it back in...
