The baby is holding someone's arm.
The bay is holding an arm.
someone's arm represented in the form of " an arm"
exists e1 x1 x2 x3.(n_baby(x1) & Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_arm(x3) & of(x3,x2) & n_person(x2))
exists e1 x1 x2.(n_bay(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_arm(x2))