Illustration A writes his name on the back of a bill of exchange. As the effect of this endorsement is to transfer the right to the bill to any person who may become the lawful holder of it, the endorsement is a "valuable security". 31. "A will". 31. "A document. will".--The words "a will" denote any testamentary 32. Words referring to acts include illegal omissions. 32. Words referring to acts include illegal omissions.--In every part of this Code, except where a contrary intention appears from the context, words which refer to acts done extend also to illegal omissions. 33. "Act". "Omission". 33. "Act". "Omission".--The word "act" denotes as well as series of acts as a single act: the word "omission" denotes as well a series of omissions as a single omission. 34. Acts done by several persons in futherance of common intention. 1*[34. Acts done by several persons in futherance of common intention.--When a criminal act is done by several persons in furtherance of the common intention of all, each of such persons is liable for that act in the same manner as if it were done by him alone.] 35.