case 2 failed: expected "15\n{1,2,3,4}\n{1,2,3},{4}\n{1,2},{3},{4}\n{1,2},{3,4}\n{1,2,4},{3}\n{1,4},{2},{3}\n{1},{2,4},{3}\n{1},{2},{3,4}\n{1},{2},{3},{4}\n{1},{2,3},{4}\n{1},{2,3,4}\n{1,4},{2,3}\n{1,3,4},{2}\n{1,3},{2,4}\n{1,3},{2},{4}" got "15\n{1,2,3,4}\n{1,2,3},{4}\n{1,2},{3,4}\n{1,2},{3},{4}\n{1,2,4},{3}\n{1,4},{2,3}\n{1},{2,3},{4}\n{1},{2,3,4}\n{1},{2,4},{3}\n{1},{2},{3,4}\n{1},{2},{3},{4}\n{1,4},{2},{3}\n{1,3,4},{2}\n{1,3},{2},{4}\n{1,3},{2,4}"
input:4