A number of people are doing a synchronized martial arts performance in the street.
A group of people are performing martial arts.
A number of people is the same as a group of people, and a performance means the same thing as performing.
exists e1 e2 s1 x1 x2 x3 x4 x5.(n_street(x5) & Theme(e2,x3) & Actor(e2,x1) & v_do(e2) & in(x3,x5) & n_performance(x3) & of(x3,x4) & n_art(x4) & a_martial(s1) & Theme(s1,x3) & Theme(e1,x3) & v_synchronize(e1) & of(x1,x2) & n_people(x2) & n_number(x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_art(x3) & a_martial(s1) & Theme(s1,x3) & of(x1,x2) & n_people(x2) & n_group(x1))