When we say that the distribution of a form is open (at least in terms of certain types of environment), we say simply that the form is productive - that is, it occurs with a class of forms whose membership we cannot accurately delimit. This is a synchronic fact [...] - Nida (1948), a pag.431 [...] the participial suffixes /-n/ and /-d/ are neverless allomorph [...] The allomorph /-d/ is productive: its potential distribution is not arbitrarily fixed like that of /-n/. - Nida (1948), a pag.432
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