A group of children in the ocean.
The child is alone playing in his playroom.
One cannot be in the ocean and in a playroom at the same time. A group of children is not a child alone.
exists x1 x2 x3.(n_ocean(x3) & a_topic(x1) & in(x1,x3) & of(x1,x2) & n_child(x2) & n_group(x1))
exists e1 s1 x1 x2.(n_playroom(x2) & of(x2,x1) & n_male(x1) & n_child(x1) & a_alone(s1) & Manner(e1,s1) & in(e1,x2) & Actor(e1,x1) & v_play(e1))