Two people show off their matching skull tattoos while two other people look on.
The couple is showing off their motorcycles to the people.
One cannot show his motorcycles and skull tattoos at the same time.
exists e1 p1 s1 s2 x1 x2 x3.(exists e2 p2 x4.(exists s3.(Theme(s3,x4) & a_on(s3)) & Topic(e2,p2) & Actor(e2,x4) & v_look(e2) & -(x4 = x1) & n_people(x4) & card_eq_2(x4)) & n_people(x1) & n_people(x1) & while(e1,p1) & a_off(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_show(e1) & n_tattoo(x2) & of(x2,x3) & n_skull(x3) & a_matching(s1) & Theme(s1,x2) & of(x2,x1) & n_thing(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(n_people(x3) & n_motorcycle(x2) & of(x2,x1) & n_thing(x1) & n_couple(x1) & to(e1,x3) & a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_show(e1))