null pair造句

First of all, I was actually quite surprised to be blocked for the null pair of edits, based on the prior discussion of SA's spelling corrections and of my proposal.
In the proposal, detecting a null pair of test edits so as not to show them at all in a watchlist would require the software to calculate " two " diffs one for the most recent edit, and one for the most recent edit before that, for each article in the watchlist, and trivially to check that both edits were by the same editor.
It's difficult to find null pair in a sentence. 用null pair造句挺难的