5;0,1,2,3,0
20;0,1,10,3,2,4,5,7,6,8,11,9,15,12,13,4,16,18,17,14
50;0,1,2,3,4,5,6,10,7,8,9,11,12,13,14,15,17,19,16,18,20,21,22,23,24,25,27,28,29,30,26,31,32,34,35,36,12,33,37,45,38,39,40,41,42,43,44,46,48,47
15;0,2,6,4,5,11,7,8,9,9,10,12,13,1,3
3;0,1,1