% Multifile declarations.
:- multifile if/2.

% load phonology and tree output
:- [trale_home(tree_extensions)].

% specify signature file
signature(signature).

phon <<< synsem.
synsem <<< dtrs.

pepa ~~> synsem:noun.
pase ~~> synsem:verb.
kozu ~~> synsem:noun.

phrase1 ## 
    (phrase,synsem:verb,dtrs:[Subj,Head])
===>
    cat> (Subj,synsem:noun),
    cat> (Head,synsem:verb).
    
phrase2 ##
    (phrase,synsem:verb,dtrs:[Head,Subj])
===>
    cat> (Head,synsem:verb),
    cat> (Subj,synsem:noun).