Musicians doing with they do best.
There is only one person in the room.
One person is not multiple musicians.
exists e1 e2 s1 x1 x2.(n_thing(x1) & ne_nam_musicians(x1) & a_best(s1) & Manner(e2,s1) & Actor(e2,x1) & v_do(e2) & with(e1,x1) & Actor(e1,x2) & v_do(e1) & (x1 = x2))
exists p1 x1 x3.(n_room(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_person(x2) & card_eq_1(x2) & r_only(x2)))