.> trees/firsttree.tex
.[
S
  NP
    Uther
  VP
    slept
.]

this bit is ignored

.> trees/secondtree.tex
.[
S
  NP
    Uther
  VP
    woke
.]

.>> trees/twotrees.tex
\item
.[
S
  NP
     Merlin
  VP
     yawned
.]
\item
.[
S\daughtergap{3ex}
  NP
    Elegabalus
  VP
    V
       threw
    NP
       Det
         a
       N
         party
.]