People are going up and down on three escalators.
people's are moving in staircase
Going up and down describes moving.. Escalators are moving staircase.
exists e2 e1 s1 x1 x2 x3.(on(e2,x3) & n_escalator(x3) & card_eq_3(x3) & r_down(e2) & Actor(e2,x2) & v_go(e2) & n_people(x2) & a_up(s1) & Manner(e1,s1) & Actor(e1,x1) & v_go(e1) & n_people(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_staircase(x3) & Actor(e1,x1) & v_move(e1) & Time(x1,x2) & n_'s(x2) & n_people(x1))