The major differences between Song's analysis and Comrie (1981) and Dixon (2000), is that Song lumps the range of lexical and morphological causatives together under the label COMPACT, in which can be “less than a free morpheme” (e.g., bound morpheme [prefix, suffix, infix, circumfix, reduplication, zero-derivation, suppletion); or “a free morpheme”, in which and [Veffect form a single grammatical unit. Most of the examples given look like serial verb constructions, and no in-depth analysis is undertaken for some of the constructions in which and [Veffect are less formally contiguous. Song notes this non-contiguity, but does not undertake to explain why it might be important.