[0,1,2,3,-1,-2,4,5,6,-3,-4,7,8,9,-5,-6,10,11,12, -7,-8,13,14,15,-9,-10,16,17,18,-11,-12,19,20,21, -13,-14,22,23,24,-15,-16,25,26,27,-17,-18,28,29, 30,-19,-20,31,32,33,-21,-22,34,35,36,-23,-24,37, 38,39,-25,-26,40,41]