A violinist practices in front of an empty performance hall.
The violinist is alone on the stage.
since stage is front part of performance hall
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x3) & of(x3,x4) & n_hall(x4) & of(x4,x5) & n_performance(x5) & a_empty(s1) & Theme(s1,x4) & n_front(x3) & n_practice(x1) & of(x1,x2) & n_violinist(x2))
exists s1 x1 x2.(n_stage(x2) & n_violinist(x1) & on(s1,x2) & Theme(s1,x1) & a_alone(s1))