\begin{document}
\btreesetexternal{%
use automatic file name,%
mode=list and make}
\btreeset{%
top padding=0pt,%
left padding=0pt,%
right padding=0pt,%
bottom padding=0pt,%
external=false,separate=true,%
label on every edge,%
left label anchor=center,%
right label anchor=center,%
continue after turn=false,%
continue at path end=false,%
level distance scales=false,%
sibling distance scales=false,%
scale=0.7}
