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| suc (a + suc b) == suc (b + suc a) | |
| ^ | |
| | | |
| | | |
| suc (suc (a + b)) == suc (b + suc a) | |
| ^ | |
| | | |
| | | |
| suc (suc (a + b)) == suc (suc (b + a)) | |
| ^ | |
| | | |
| | | |
| a + b == b + a |
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