A student reclines while lecturers lecture.
The lecturers are practicing in an empty room
The room condition is contradictory. If a student is in the room, it is not empty.
exists e1 p1 x1.(exists e2 x2.(Actor(e2,x2) & v_lecture(e2) & n_lecturer(x2)) & while(e1,p1) & Actor(e1,x1) & v_recline(e1) & n_student(x1))
exists e1 s1 x1 x2.(n_lecturer(x1) & in(e1,x2) & n_room(x2) & a_empty(s1) & Theme(s1,x2) & Actor(e1,x1) & v_practice(e1))