premise: A boy on a skateboard ramp.
hypothesis: There is a boy on a ramp
explanation_1: Skateboard ramp is a form of ramp.
explanation_2: A BOY SKATEBOARDS ON A RAMP
explanation_3: Skating is done on a ramp.
premise_logic: exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & n_ramp(x2) & of(x2,x3) & n_skateboard(x3) & n_boy(x1))
hypothesis_logic: exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_ramp(x3) & n_boy(x2))