Number 13 is holding a football while a football game is going on.
The player is bike riding at the game.
The one holding a football while a football game is going on cannot be the one riding at the game.
exists e1 p1 x1 x2.(ne_tim_number(x1) & n_date(x1) & a_date_day_13(x1) & a_date_day_13(x1) & exists e2 s1 x3 x4.(a_on(s1) & Manner(e2,s1) & Actor(e2,x3) & v_go(e2) & n_game(x3) & of(x3,x4) & n_football(x4)) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_football(x2))
exists p1 x1 x2.(n_game(x2) & n_player(x1) & at(p1,x2) & exists x3 x4.((x1 = x3) & n_riding(x3) & of(x3,x4) & n_bike(x4)))