The students' solution was to create a Welcome Wagon program to cordially introduce new students to their class.

This reminds us of what Sextus calls a diallel. A diallel is a situation where we need a in order to “prove” b and b in order to “prove” a (PH, I, 169), so that we can't prove anything.

a subjunction to a sentence

It is a grave mistake to overshow your stock, and one that the novice must always guard against.