A feature of a construction may also be the primacy of one of its classes over the others. For example, 'X' could be considered primary and 'Y' secondary in a construction if 'X' occurred in every instance of the construction while 'Y' appeared only in some instances.
- Harris (1951), a pag.328

A particularly frequent features of constructions, and of all constructions having the same domain, is their relation to contours and junctures […]. Thus in the Semitic example above, all word constructions, and only word construction, had precisely one main stress; and compound word always had a secondary stress on each sub-construction ('FB') before the last.
- Harris (1951), a pag.328