A group lies in the snow while someone on a blue snow sled jumps over them.
The boy jumps over his six friends thanks to the snow ramp they built for the sleds.
A group doesn't necessarily imply six friends. A snow sled jumping doesn't necessarily imply a snow ramp.
exists e1 p1 x1 x2.(n_thing(x2) & n_snow(x2) & exists e2 s1 x3 x4 x5.(Theme(e2,x5) & Actor(e2,x3) & v_sled(e2) & over(x5,x2) & n_jump(x5) & on(x3,x4) & n_snow(x4) & a_blue(s1) & Theme(s1,x4) & n_person(x3)) & while(e1,p1) & in(e1,x2) & Actor(e1,x1) & v_lie(e1) & n_group(x1))
exists e2 e1 x1 x2 x3 x4 x5 x6 x7.(n_sled(x7) & n_thing(x1) & n_ramp(x4) & of(x4,x5) & n_snow(x5) & n_thanks(x2) & of(x2,x3) & n_friend(x3) & card_eq_6(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & over(e1,x2) & to(x2,x4) & for(e2,x7) & Theme(e2,x6) & Actor(e2,x1) & v_build(e2) & (x4 = x6) & Actor(e1,x1) & v_jump(e1))