In light of their analysis of Kashibo-Kakataibo prefixation, Zariquiey and Fleck present two diachronic scenarios to orient future comparative work : " ( 1 ) prefixation evolved from productive noun incorporation ( prefixes have come from longer body-part nouns ); or ( 2 ) Proto-Panoan body-part terms were monosyllabic forms that became bound, and most of the current body-part terms were later built up from these " ( 2012 : 408 ).
