Consider
$\begin{align*} &1.\quad \lnot R \lor \lnot T \lor U\\ &2.\quad R\\ &3.\quad T \end{align*}$
It seems clear that you can end up with this: $4.\quad U$
Now then, number $4$ was made by using disjunctive syllogism on three statements at the same time. Is that alright (for, say, a formal proof in a test), or am I supposed to do it "slower" and only do inferences with two statements at a time?
Another title for this question could have been: Is it alright to do inferences with more than two statements simultaneously? But, apparently, the destructive dilemma inference rule actually uses three statements anyway, so I guess I should keep this to just disjunctive syllogisms.