class modifier_on_x
{
    + x_modifier;
    - shallow_auxiliary;
    Root >> Incise;
    node Incise : [cat:incise, id:incise, type: std];
    node(Incise).top.sync = node(Incise).bot.sync;
    node(Incise).top.sync = value(-);
    node(Incise).adjleft = value(atmostone);
    node(Incise).adjright = value(sync);
    Incise >>+ Modifier;
%%    node(Root).bot = node(Foot).top;
}