Statement

Try and find a relationship between A and B.

A B
a - b - $\left(\vphantom{ c-% d}\right.$c - d$\left.\vphantom{ c-% d}\right)$ a - $\left(\vphantom{ b-% c-% d}\right.$b - c - d$\left.\vphantom{ b-% c-% d}\right)$