A man sitting in front of a crowd of children playing the cello and a woman beside him playing a harp while the children listen.
Nobody is playing a string instrument.
Either a man and a woman are each playing an instrument or nobody is.
exists e1 e2 p1 x1 x2 x3 x4 x5 x6 x7 x8 x9.(n_male(x8) & n_cello(x8) & a_topic(x1) & in(e1,x3) & of(x3,x4) & of(x4,x5) & Theme(e2,x7) & Actor(e2,x6) & v_play(e2) & subset_of(x9,x7) & exists e3 p2 x10.(exists e4.(Actor(e4,x5) & v_listen(e4)) & while(e3,p2) & Theme(e3,x10) & Actor(e3,x8) & v_play(e3) & n_harp(x10)) & n_child(x5) & n_child(x5) & beside(x9,p1) & n_woman(x9) & subset_of(x8,x7) & (x5 = x6) & n_crowd(x4) & n_front(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
-exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_instrument(x2) & of(x2,x3) & n_string(x3) & n_person(x1))