premise: A mountain biker rides up a hill on a red bicycle.
hypothesis: The biker rode down the hill.
explanation_1: Riding up and riding down are two different directions.
explanation_2: One can not ride up and ride down a hill simultaneously.
explanation_3: A biker cannot ride up a hill while simultaneously riding down the hill.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4.(a_up(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & on(x3,x4) & n_bicycle(x4) & a_red(s1) & Theme(s1,x4) & n_hill(x3) & n_biker(x1) & of(x1,x2) & n_mountain(x2))
hypothesis_logic: exists e1 x1 x2.(n_hill(x2) & n_biker(x1) & down(e1,x2) & Actor(e1,x1) & v_ride(e1))
premise_sim: exists e1 s1 s2 x1 x2 x3 x4.(v_ride(e1) & on(x3,x4) & of(x1,x2) & n_mountain(x2) & n_hill(x3) & n_biker(x1) & n_bicycle(x4) & a_up(s2) & a_red(s1) & Theme(s1,x4) & Theme(e1,x3) & Manner(e1,s2) & Actor(e1,x1))
hypothesis_sim: exists e1 x1 x2.(v_ride(e1) & n_hill(x2) & n_biker(x1) & down(e1,x2) & Actor(e1,x1))