3. A statement of paired facts.
In many cases, two facts combined are more powerful than either one on its own. The paradigmatic example is the opening line of Carson McCullers’ The Heart Is a Lonely Hunter: “In the town there were two mutes, and they were always together.” A town with two mutes is not necessarily compelling, nor are two inseparable men. But a town with two inseparable mutes? Now that locks in our interest.