class PP_or_CS_coord_block 
{
    + PP_or_CS_coord_block;
    node Alt: [type: alternative, id: $id];
    Alt >> PP;
    node PP: [type: subst, cat:PP, id: $id];
    Alt >> CS;
    node CS: [type: subst, cat:CS, id: $id, bot: [que: ~que]];
    PP < CS;
    Alt >> SRel;
    CS < SRel;
    node SRel: [cat:S, id: $id, type:subst, top:[sat: -,
                                                 mode: conditional|subjonctive|indicative,
                                                 extraction: rel,
                                                 xarg: [trace: -, case: ~quemod]
                                                 ]
                ];
}