By definition a trilogy is " a series or group of three plays, novels, operas, etc., that, although individually complete, are closely related in theme, sequence, or the like. So they qualify. I don't thing Ford regarded them as a trilogy.
By definition a trilogy is " a series or group of three plays, novels, operas, etc., that, although individually complete, are closely related in theme, sequence, or the like. So they qualify. I don't thing Ford regarded them as a trilogy.