A pair of men sit outside while one plays the accordion and the other plays a wind instrument.
Nobody is playing music.
A pair of men refers to two people, whereas nobody is zero men
exists e1 p1 s1 x1 x2 x5 x8.(-(x8 = x8) & n_play(x8) & n_accordion(x5) & exists e2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_play(e2) & all x6 x7.((n_instrument(x6) & of(x6,x7) & n_wind(x7)) -> (subset_of(x8,x4) & for(x8,x6))) & subset_of(x5,x4) & n_thing(x3) & card_eq_1(x3)) & while(e1,p1) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_man(x2) & n_pair(x1))
-exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2) & n_person(x1))