Golang 数组穷举所有组合（不交叉顺序）
=== RUN TestArrayExhaustivitySort
[["1","2","3","4"],["1","2","4"],["1","3","4"],["2","3","4"],["1","2","3"],["2","4"],["1","3"],["3","4"],["2","3"],["1","2"],["1","4"],["4"],["2"],["1"],["3"]]
--- PASS: TestArrayExhaustivity (0.00s)
PASS
Process finished with exit code 0