add_list
add_list(t2, &(play[t2].own_list), t1);
void add_list(int, OWN **, int);
add_list(plr, &(play[plr].own_list), cur_p->loc);
add_list(pn, &(tp->prop_list), sqnum(op->sqr));
add_list(to->trader, &(pl_to->own_list), sqnum(op->sqr));