class verb_canonical 
{
    <: _verb_canonical;
    desc.extraction = value(~adjx);
    v +
        desc.extraction = value(-)
        |
        desc.extraction = value(~-|adjx),
        node(S).bot.extraction = value(adjx)
        ;
    $arg0::xcomp_by_adj = value(-);
    $arg1::xcomp_by_adj = value(-);
    $arg2::xcomp_by_adj = value(-);
    desc.short_sentence = value(-);
}