First, the -ed suffix of denominal adjectives behaves in the same way as that of adjectival and verbal passives in displaying phonologically conditioned allomorphy, as shown in (16).
i follow Arregi and Nevins's (2014) analysis of pluralia tantum nouns, where these nouns are assumed to have their n head specified for [−group], and, if Num is present in structure, they must appear with the Num head specified as [−singular].