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| item |
|---|
| ABC4 |
| previous_item | new_item |
|---|---|
| ABC1 | ABC2 |
| ABC1 | ABC3 |
| ABC2 | ABC3 |
| ABC3 | ABC4 |
| item | previous_item |
|---|---|
| ABC4 | ABC1 |
| ABC4 | ABC2 |
| ABC4 | ABC3 |
| item |
|---|
| ABC4 |
| previous_item | new_item |
|---|---|
| ABC1 | ABC2 |
| ABC1 | ABC3 |
| ABC2 | ABC3 |
| ABC3 | ABC4 |
| item | previous_item |
|---|---|
| ABC4 | ABC1 |
| ABC4 | ABC2 |
| ABC4 | ABC3 |