"The matter here is not about extracting the closed contour, it is done otherwise. Rather, it concerns the closed contour that Given/Find does not solve. I have tried almost anything in the program style below, not to avail. Easy to see that the free flying version and the programmed one don't scan in the same way. The programmed version has no liberty to spread either x, or y ... therefore no solution can be found as there are in fact no exact pairs ... most interesting ! "
jmG