Two mountain climbers sit on a mountain.
two climbers are sitting
Sit is a rephrasing of sitting.
exists e1 x1 x2 x3.(on(e1,x3) & n_mountain(x3) & Actor(e1,x1) & v_sit(e1) & n_climber(x1) & of(x1,x2) & n_mountain(x2) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_sit(e1) & n_climber(x1) & card_eq_2(x1))