Students are sitting lined up on stair steps while they wait and check their electronic devices.
Some students are waiting to vote.
Just because the students are on stair steps while they wait and check their electronic devices does not mean that they are waiting to vote.
exists e1 p1 s2 x1 x4.(exists e2 p2 s1 x2 x3.(exists e3 e4.(Theme(e4,x4) & Actor(e4,x1) & v_check(e4) & Actor(e3,x1) & v_wait(e3)) & while(e2,p2) & on(e2,x2) & n_step(x2) & of(x2,x3) & n_stair(x3) & a_up(s1) & Manner(e2,s1) & Theme(e2,x1) & v_line(e2)) & n_device(x4) & a_electronic(s2) & Theme(s2,x4) & of(x4,x1) & n_thing(x1) & n_thing(x1) & Topic(e1,p1) & Actor(e1,x1) & v_sit(e1) & n_student(x1))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2.(Actor(e2,x1) & v_vote(e2)) & n_student(x1))