reason out

That is one reason out of half a dozen why I so often prefer the first.

Hence we must resort to logic, and reason out the two hypotheses.

Thus did Sangiorgio reason out the cause of such prolonged and lasting vigour.

Our business, however, is to reason out the laws for ourselves, not to take the examples as we find them.

“The more I try to reason out the whole thing, the more in the dark I am,” Bab answered.