s := [ HEAD verb, SPR <>, COMPS <> ].

vp := [ HEAD verb, SPR < [] >, COMPS <> ].

v := [ HEAD verb ].

np := [ HEAD noun, SPR <>, COMPS <> ].

n := [ HEAD noun, SPR < [] > ].

det := [ HEAD det ].

pp := [ HEAD prep, SPR <>, COMPS <> ].

p := [ HEAD prep ].