2. It is a rule that when words are used which will bear a natural sense and an artificial one, or one to be made out by argument and inference, the natural sense shall prevail; it. is simply a rule of construction and not of addition common intent cannot add to a sentence words which have been omitted. 2 H. Black. 530. In pleading, certainty is required, but certainty to a common intent is sufficient; that is, what upon a reasonable construction may be called certain, without recurring to possible facts. Co. Litt. 203, a; Dougl. 163. See Certainty.