Stowell (1979) argues that an intermediate level of structure between foot and word tree is necessary: superfeet or cola. Cola are metrical constituents built on the output of footing. Stowell's argument is based on the accentual systems of Passamaquoddy and Seneca. However, in both cases, the analysis is for one reason or another questionable. First, P. LeSourd (personal communication) has suggested that the Passamaquoddy data are more complex than the sample Stowell presents, which undercuts his account. (Stowell's data are drawn from LeSourd's fieldwork.) Second, the Seneca analysis rests on the assumption that bounded and unbounded feet cannot cooccur in the same language – not a necessary component of metrical theory.