2 guys are parachuting and are in midair.
There are two men tandem skydiving.
Parachuting is not necessarily tandem skydiving.
exists p1 s1 x1 x2.(exists x3.(in(x2,x3) & n_midair(x3)) & n_guy(x2) & n_date(x2) & a_date_day_02(x2) & a_date_day_02(x2) & Theme(s1,x1) & a_parachuting(s1) & n_guy(x1) & n_date(x1) & a_date_day_02(x1) & a_date_day_02(x1))
exists e1 p1 p2 x1 x2.(exists e2.(Actor(e2,x1) & v_skydive(e2)) & Topic(e1,p2) & Actor(e1,x1) & v_tandem(e1) & exists x3.((x2 = x3) & n_man(x3) & card_eq_2(x3)) & (x1 = x2))