A group surrounds to students as the practice martial arts.
THe students are taking a science test.
one group is practicing martial arts while the other group is taking a science test
exists e1 s1 x1 x2 x3 x4.(n_art(x3) & a_martial(s1) & Theme(s1,x3) & of(x3,x4) & n_practice(x4) & to(e1,x2) & as(x2,x3) & n_student(x2) & Actor(e1,x1) & v_surround(e1) & n_group(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_take(e1) & n_test(x3) & of(x3,x4) & n_science(x4) & n_student(x1) & (x1 = x2) & ne_nam_the(x2))