s := phrase & [ HEAD verb, SPR <>, COMPS <> ]. vp := phrase & [ HEAD verb, SPR < [] >, COMPS <> ]. v := [ HEAD verb ]. np := phrase & [ HEAD noun, SPR <>, COMPS <> ]. n := [ HEAD noun, SPR < [] > ]. det := [ HEAD det ]. pp := phrase & [ HEAD prep, SPR <>, COMPS <> ]. p := [ HEAD prep ].