Hmm, I think the example of "a heap of sand" slightly confuses me. If there is "a heap" of sand, then there must be at least 1 sand grain. Then how is it different from "some" in this regard?

IF there is a thing called De Morgan's Law, THEN it would help me to learn the contrapositive of conjunctions AND the contrapositive of disjunctions.

Contrapositive:

IF a thing could not help me learn the contrapositive of conjunctions OR the contrapositive of disjunctions, THEN this thing is not called De Morgan's Law.