caaaar
caaadr
caaar
caadar
caaddr
caadr
caar
cadaar
cadadr
cadar
caddar
cadddr
caddr
cadr
cdaaar
cdaadr
cdaar
cdadar
cdaddr
cdadr
cdar
cddaar
cddadr
cddar
cdddar
cddddr
cdddr
cddr
copy-tree
nsublis
nsubst
nsubst-if
nsubst-if-not
nthcdr
sublis
subst
subst-if
subst-if-not
tree-equal