Github user dkuppitz commented on the pull request:
https://github.com/apache/incubator-tinkerpop/pull/320#issuecomment-221869056
> For the latter, should it be `not(both().both())`?
Since we only look at it in conjunction with `count().is(something)`, we
don't need to differentiate between single steps and longer chains.
`both().not(both())` is the same thing as `not(both().both())`.
It makes a difference if something comes after `is(0)`, but in that case we
don't use `not()`:
`both().both().count().is(0).both() ->
both().both().limit(1).count().is(0).both()`
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