remove duplocate neighbours of surfels that are enoighbour of both contracted points
remove duplocate neighbours of surfels that are enoighbour of both contracted points

0x0AF/lamure,vrsys/lamure,0x0AF/lamure,0x0AF/lamure,vrsys/lamure,vrsys/lamure,vrsys/lamure,0x0AF/lamure