Three naked little boys are playing in a river and are covered in mud; one is standing up.
Two boys are crouched down.
One boy standing up does not imply the boys are crouched down.
exists e2 e1 e3 s1 s2 s3 s4 s5 x1 x2 x3 x4 x5.(a_up(s5) & Manner(e3,s5) & Actor(e3,x5) & v_stand(e3) & n_thing(x5) & card_eq_1(x5) & in(e2,x4) & n_mud(x4) & Theme(e2,x3) & v_cover(e2) & n_boy(x3) & a_little(s4) & Theme(s4,x3) & a_naked(s3) & Theme(s3,x3) & card_eq_3(x3) & in(e1,x2) & n_river(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_little(s2) & Theme(s2,x1) & a_naked(s1) & Theme(s1,x1) & card_eq_3(x1))
exists e1 s1 x1.(a_down(s1) & Manner(e1,s1) & Theme(e1,x1) & v_crouch(e1) & n_boy(x1) & card_eq_2(x1))