premise: A man wearing black pants rides along a concrete ledge on rollerblades.
hypothesis: The ledge is made of a hard substance.
explanation_1: concrete is a hard substance which the ledge is made out of.
explanation_2: the first sentence says concrete ledge, which is known to be hard substance
explanation_3: Concrete is a hard substance.
premise_logic: exists e2 e1 s1 s2 x1 x2 x3 x4 x5.(along(e2,x4) & on(x4,x5) & n_rollerblade(x5) & n_ledge(x4) & a_concrete(s2) & Theme(s2,x4) & Actor(e2,x1) & v_ride(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_pants(x3) & a_black(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
hypothesis_logic: exists e1 s1 x1 x2.(n_ledge(x1) & of(e1,x2) & n_substance(x2) & a_hard(s1) & Theme(s1,x2) & Theme(e1,x1) & v_make(e1))