A mountain hiker is digging steaks into the thck snow.
A mountain hiker is eating pizza while sitting in thick snow.
One cannot be digging and eating simultaneously.
exists e1 x1 x2 x3 x4 x5.(n_snow(x4) & of(x4,x5) & n_thck(x5) & into(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_dig(e1) & n_steak(x3) & n_hiker(x1) & of(x1,x2) & n_mountain(x2))
exists e1 p1 s1 x1 x2 x3.(while(p1,e1) & in(e1,x3) & n_snow(x3) & a_thick(s1) & Theme(s1,x3) & Actor(e1,x1) & v_sit(e1) & exists s2 x4.((x1 = x4) & n_pizza(x4) & a_eating(s2) & Theme(s2,x4)) & n_hiker(x1) & of(x1,x2) & n_mountain(x2))