Two infant boys in diapers and a young girl in a wetsuit play on the beach with shovels and buckets for the sand.
People are hiking at the mountains.
There are either people or infants.  They are either hiking or playing in the sand.  One can not be at the mountains and at a beach simultaneously.
exists s1 s2 s3 s4 x1 x2 x3 x4 x5 x6 x7 x8 x9.(n_sand(x9) & n_beach(x5) & a_topic(s1) & subset_of(x3,s1) & in(x3,x4) & for(x4,x9) & on(x4,x5) & with(x5,x6) & subset_of(x8,x6) & n_bucket(x8) & subset_of(x7,x6) & n_shovel(x7) & n_play(x4) & a_wetsuit(s4) & Theme(s4,x4) & n_girl(x3) & a_young(s3) & Theme(s3,x3) & subset_of(x1,s1) & in(x1,x2) & n_diaper(x2) & n_boy(x1) & a_infant(s2) & Theme(s2,x1) & card_eq_2(x1))
exists e1 x1 x2.(n_mountain(x2) & at(e1,x2) & Actor(e1,x1) & v_hike(e1) & n_people(x1))