N=50; beads=[202,23,45,102,43,55,112,63,65,102,3,385,202,93,5,102,3,85,102,73,85,102,83,15,102,13,45,102,23,5,102,3,85,102,3,5,102,3,5,102,3,5,102,3,17,112,13,5,102,23];