Two guys are doing back flips using some kind of equipment on their feet.
Two guys are practicing for the circus and doing back flips using some kind of equipment on their feet.
Just because you are doing back flips, does not mean you are practicing for the circus.
exists e2 e1 p1 s1 x1 x2 x5.(exists e3 x3 x4.(Theme(e3,x3) & Actor(e3,x1) & v_use(e3) & of(x3,x4) & on(x4,x5) & n_equipment(x4) & n_kind(x3)) & n_foot(x5) & of(x5,x1) & n_thing(x1) & Topic(e2,p1) & Actor(e2,x1) & v_flip(e2) & a_back(s1) & Manner(e1,s1) & Actor(e1,x2) & v_do(e1) & (x1 = x2) & n_guy(x1) & card_eq_2(x1))
exists e2 e3 e1 p1 s1 x1 x2 x3 x6.(n_foot(x6) & of(x6,x2) & n_thing(x2) & n_circus(x2) & exists e4 x4 x5.(Theme(e4,x4) & Actor(e4,e2) & v_use(e4) & of(x4,x5) & on(x5,x6) & n_equipment(x5) & n_kind(x4)) & Topic(e3,p1) & Actor(e3,e2) & v_flip(e3) & a_back(s1) & Manner(e2,s1) & Actor(e2,x3) & v_do(e2) & n_thing(x3) & for(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_guy(x1) & card_eq_2(x1))