premise: A young man, without apparent protective gear, is on a bicycle jumping over small hills of sand or gravel, with a long bridge and tall buildings in the background.
hypothesis: A young male is riding his bicycle over small hills.
explanation_1: If a young male is described as 'on a bicycle jumping over small hills' this indicates that he is 'riding his bicycle'.
explanation_2: When a young make is jumping a bicycle over small hills it is assumed that he is riding a bicycle.
explanation_3: Young man is a young male, and riding his bicycle is a rephrasing of on a bicycle.
premise_logic: exists p1 s1 x1 x10.(n_background(x10) & exists e1 s4 s5 s6 s7 x3 x4 x5 x6 x7 x8 x9.(on(x1,x3) & with(e1,x7) & subset_of(x9,x7) & in(x9,x10) & n_building(x9) & a_tall(s7) & Theme(s7,x9) & subset_of(x8,x7) & n_bridge(x8) & a_long(s6) & Theme(s6,x8) & a_over(s5) & Manner(e1,s5) & Theme(e1,x5) & Actor(e1,x4) & v_jump(e1) & of(x5,x6) & (n_sand(x6) | n_gravel(x6)) & n_hill(x5) & a_small(s4) & Theme(s4,x5) & (x3 = x4) & n_bicycle(x3)) & -exists s2 s3 x2.(with(x1,x2) & n_gear(x2) & a_protective(s3) & Theme(s3,x2) & a_apparent(s2) & Theme(s2,x2)) & n_man(x1) & a_young(s1) & Theme(s1,x1))
hypothesis_logic: exists e1 s1 s2 x1 x2 x3.(over(e1,x3) & n_hill(x3) & a_small(s2) & Theme(s2,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x2) & of(x2,x1) & n_male(x1) & n_male(x1) & a_young(s1) & Theme(s1,x1))