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| a_part | b_part | a | b | lev |
|---|---|---|---|---|
| abc | aaa | def,ghi, | bbb,ccc, | 1 |
| def | bbb | ghi, | ccc, | 2 |
| ghi | ccc | 3 |
| a_part | b_part | a | b | lev |
|---|---|---|---|---|
| abc | aaa | def,ghi, | bbb,ccc, | 1 |
| def | bbb | ghi, | ccc, | 2 |
| ghi | ccc | 3 |