Girl is playing the guitar in front of a group of people.
Some guy was playing the flute down by the pier.
A girl playing a guitar is different from a guy playing a flute.
exists e1 x1 x2 x3 x4 x5.(n_guitar(x2) & ne_nam_girl(x1) & in(e1,x3) & of(x3,x4) & of(x4,x5) & n_people(x5) & n_group(x4) & n_front(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1))
exists e1 s1 x1 x2 x3.(n_pier(x3) & n_flute(x2) & by(e1,x3) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guy(x1))