 The usual notational convention in CL is to drop parentheses from left-associated terms together with the outmost pair. For instance, \(xyz\) would be fully written as \(((xy)z)\), whereas \(xy(xz)\) and \((xy)(xz)\) are both “shorthand versions” of the term \(((xy)(xz))\) (unlike \(xyxz\)). Grouping in terms delineates subterms. For instance, \(xy\) is a subterm of each of the terms mentioned in this paragraph, whereas \(yz\) and \(yx\) are subterms of none of those terms.