从1-20中选出5个号码的所有组合（不超过2个重复）

以下是从1到20的数字中选取5个号码的所有组合，每个组合最多包含2个相同的数字：

'1 2 3 4 5' '1 2 3 4 6' '1 2 3 4 7' '1 2 3 4 8' '1 2 3 4 9' '1 2 3 5 6' '1 2 3 5 7' '1 2 3 5 8' '1 2 3 5 9' '1 2 3 6 7' '1 2 3 6 8' '1 2 3 6 9' '1 2 3 7 8' '1 2 3 7 9' '1 2 3 8 9' '1 2 4 5 6' '1 2 4 5 7' '1 2 4 5 8' '1 2 4 5 9' '1 2 4 6 7' '1 2 4 6 8' '1 2 4 6 9' '1 2 4 7 8' '1 2 4 7 9' '1 2 4 8 9' '1 2 5 6 7' '1 2 5 6 8' '1 2 5 6 9' '1 2 5 7 8' '1 2 5 7 9' '1 2 5 8 9' '1 2 6 7 8' '1 2 6 7 9' '1 2 6 8 9' '1 2 7 8 9' '1 3 4 5 6' '1 3 4 5 7' '1 3 4 5 8' '1 3 4 5 9' '1 3 4 6 7' '1 3 4 6 8' '1 3 4 6 9' '1 3 4 7 8' '1 3 4 7 9' '1 3 4 8 9' '1 3 5 6 7' '1 3 5 6 8' '1 3 5 6 9' '1 3 5 7 8' '1 3 5 7 9' '1 3 5 8 9' '1 3 6 7 8' '1 3 6 7 9' '1 3 6 8 9' '1 3 7 8 9' '1 4 5 6 7' '1 4 5 6 8' '1 4 5 6 9' '1 4 5 7 8' '1 4 5 7 9' '1 4 5 8 9' '1 4 6 7 8' '1 4 6 7 9' '1 4 6 8 9' '1 4 7 8 9' '1 5 6 7 8' '1 5 6 7 9' '1 5 6 8 9' '1 5 7 8 9' '1 6 7 8 9' '2 3 4 5 6' '2 3 4 5 7' '2 3 4 5 8' '2 3 4 5 9' '2 3 4 6 7' '2 3 4 6 8' '2 3 4 6 9' '2 3 4 7 8' '2 3 4 7 9' '2 3 4 8 9' '2 3 5 6 7' '2 3 5 6 8' '2 3 5 6 9' '2 3 5 7 8' '2 3 5 7 9' '2 3 5 8 9' '2 3 6 7 8' '2 3 6 7 9' '2 3 6 8 9' '2 3 7 8 9' '2 4 5 6 7' '2 4 5 6 8' '2 4 5 6 9' '2 4 5 7 8' '2 4 5 7 9' '2 4 5 8 9' '2 4 6 7 8' '2 4 6 7 9' '2 4 6 8 9' '2 4 7 8 9' '2 5 6 7 8' '2 5 6 7 9' '2 5 6 8 9' '2 5 7 8 9' '2 6 7 8 9' '3 4 5 6 7' '3 4 5 6 8' '3 4 5 6 9' '3 4 5 7 8' '3 4 5 7 9' '3 4 5 8 9' '3 4 6 7 8' '3 4 6 7 9' '3 4 6 8 9' '3 4 7 8 9' '3 5 6 7 8' '3 5 6 7 9' '3 5 6 8 9' '3 5 7 8 9' '3 6 7 8 9' '4 5 6 7 8' '4 5 6 7 9' '4 5 6 8 9' '4 5 7 8 9' '4 6 7 8 9' '5 6 7 8 9'