I noticed the term "syllable" doesn't appear in the paper. If you use single utterances to convey things, and mostly are uttering across treetops far away to s

I noticed the term "syllable" doesn't appear in the paper. If you use single utterances to convey things, and mostly are uttering across treetops far away to share things others aren't seeing directly (much less chatty when sitting together and everyone is sharing experience), then maybe when you run out of single noises that carry, you might make multi-part noises to mean single things. Is that composition? Also, given the data, "prominent" (in abstract) seems to be overworking.