Given, moreover, that it is implausible to derive the transitive from the ditransitive causative considering the morphological makeup, the common base approach is the only approach that is left to account for the contrast in (42).
(27) a. Taroo-ga sira-o kir-Ø-ta (>kit-ta), T.-NOM white-ACC √detach-CAUS-PST Ziroo-mo {soo si-ta/ kit-ta} Z.-also so do-PST/ (see above) 'Taroo dissembled.