-These three definitions are all equivalent.
-In words, `mcompose f g a` feeds the a (which has type α) to g, which
-returns a list of βs; each β in that list is fed to f, which returns a
-list of γs.
+These three definitions are all equivalent. In words, `mcompose f g
+a` feeds the a (which has type α) to g, which returns a list of βs;
+each β in that list is fed to f, which returns a list of γs. The
+final result is the concatenation of those lists of γs.