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8 puzzled with Manhattan as heuristic

temp[pos[0]][pos[1]],temp[pos[0]-1][pos[1]-1]=temp[pos[0]-1][pos[1]],temp[pos[0]][pos[1]] temp[pos[0]][pos[1]],temp[pos[0]][pos[1]-1]=temp[pos[0]][pos[1]-1],temp[pos ...