Two dancers in a street performance.
A person is dancing alone.
If there are two dancers then it would be impossible also for a person to dance alone.
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_performance(x2) & of(x2,x3) & n_street(x3) & n_dancer(x1) & card_eq_2(x1))
exists e1 s1 x1.(a_alone(s1) & Manner(e1,s1) & Actor(e1,x1) & v_dance(e1) & n_person(x1))