A teacher at the front of a small blackboard opening a book for a class of young children.
The teacher is in front of a class of children.
If the teacher is at the front of a blackboard, it follows that they are in front of a class.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(n_front(x2) & a_topic(x1) & at(x1,x2) & of(x2,x3) & Theme(e1,x5) & Actor(e1,x4) & v_open(e1) & for(x5,x6) & of(x6,x7) & n_child(x7) & a_young(s2) & Theme(s2,x7) & n_class(x6) & n_book(x5) & (x3 = x4) & n_blackboard(x3) & a_small(s1) & Theme(s1,x3) & n_teacher(x1))
exists p1 x1.(n_teacher(x1) & exists x2 x3 x4.(in(x1,x2) & of(x2,x3) & of(x3,x4) & n_child(x4) & n_class(x3) & n_front(x2)))