I do not think the single quotes will do that job. So I would suggest that you have to say "Y and Z together", or "Y together with Z"; or, perhaps better still, "a <or 'the'> combination of Y …
You can certainly say . . . it's not OK to not learn from them. However, bear in mind that there are still people around who mistakenly believe that such a construction is a split …
TL;DR: "or not" is never required if the alternative is a simple negation of the stated proposition, but an "or" clause is required in, say, "You must choose whether to write …
"I walked out to not agree with him because silence denotes assent." The first leaves it unclear whether I disagreed with him; the second is quite clear. Even with the two …
It*is*n't vs Its*not. This obviously matters a whole lot for rhythm and rhyme. Sometimes (though rarely) it is worth avoiding the harsh 's' sound from it's not due to microphones' …
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