Three guys, one playing the guitar, one playing the keyboard accordion and one playing the violin.
All three guys are playing guitars.
One is less than all.
exists e2 e3 e1 x1 x2 x3 x4 x5 x6 x7 x8.(n_violin(x8) & n_accordion(x5) & of(x5,x6) & n_keyboard(x6) & n_guitar(x3) & Theme(e3,x8) & Actor(e3,x7) & v_play(e3) & n_thing(x7) & card_eq_1(x7) & Theme(e2,x5) & Actor(e2,x4) & v_play(e2) & n_thing(x4) & card_eq_1(x4) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & rel(x1,x2) & n_thing(x2) & card_eq_1(x2) & n_guy(x1) & card_eq_3(x1))
all x1.((n_guy(x1) & card_eq_3(x1)) -> exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2)))