Let A and B stand for the two kinds of words.

Let A and B be arbitrary formula of a formal language .

Specifically, let A and B be any two sets.

Let B be the number of these assignments which result in blocking.

Yet another possibility would be to let B be .

Let B be the amount of the initial bet.

Let A and B be any two expressions of the primary algebra.

Let A and B be some matrices which elements are complex numbers.

Let B be the jth line of the second file.

Let A and B be two fuzzy subsets of X.