Created
June 2, 2017 16:25
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| a a | |
| a b | |
| a c | |
| b a | |
| b 2 | |
| c 1 | |
| d a | |
| d b | |
| d 1 | |
| d 2 | |
| => | |
| a a b c | |
| b a 2 | |
| c 1 | |
| d a b 1 2 |
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