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| before_remove | after_remove |
|---|---|
| ["a", "b", "c", "b"] | ["a", "c", "b"] |
| before_remove | after_remove |
|---|---|
| ["a", "b", "c", "b"] | ["a", "b", "c"] |
| before_remove | after_remove |
|---|---|
| ["a", "b", "c", "b"] | ["a", "c", "b"] |
| before_remove | after_remove |
|---|---|
| ["a", "b", "c", "b"] | ["a", "b", "c"] |