premise: Right leg in a brace, a young boy lies on the couch while using his cellphone.
hypothesis: The right leg is in a brace
explanation_1: Only one leg is described, so 'the' is appropriate; since it is described as in a brace, it is in a brace.
explanation_2: Right leg in a brace is a paraphrase of right leg is in a brace.
explanation_3: If his right leg is in a brace, then his leg is in a brace.
premise_logic: exists e2 e1 s1 x1 x2 x3 x4 x5.(n_cellphone(x5) & of(x5,x2) & n_male(x2) & n_couch(x2) & while(e1,e2) & Theme(e2,x5) & Actor(e2,x1) & v_use(e2) & r_right(e1) & rel(e1,x3) & in(x3,x4) & n_brace(x4) & n_leg(x3) & on(e1,x2) & Actor(e1,x1) & v_lie(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
hypothesis_logic: exists p1 s1 x1.(n_leg(x1) & a_right(s1) & Theme(s1,x1) & exists x2.(in(x1,x2) & n_brace(x2)))
premise_sim: exists e2 e1 s1 x1 x2 x3 x4 x5.(while(e1,e2) & v_use(e2) & v_lie(e1) & rel(e1,x3) & r_right(e1) & on(e1,x2) & of(x5,x2) & n_male(x2) & n_leg(x3) & n_couch(x2) & n_cellphone(x5) & n_brace(x4) & n_boy(x1) & in(x3,x4) & a_young(s1) & Theme(s1,x1) & Theme(e2,x5) & Actor(e2,x1) & Actor(e1,x1))
hypothesis_sim: exists s1 x1.(n_leg(x1) & exists x2.(n_brace(x2) & in(x1,x2)) & a_right(s1) & Theme(s1,x1))