Well I found out (at my expense
) that I can't nest p's, though calibre does not make it clear immediately, and what I'm working on is already in a p. But anyway, this is details. Even if I were to use <p>'s, what difference would it make? I'd still need to select the first of every three.
(This is for some poetry, in which the first verse of evry tercet is more indented than the other two.)