A lady in a fold up chair eats while a man looks inside a car door that is parked on a curb.
These two individuals are not the same sex.
In sentence one, one woman and one man were mentioned and then in second sentence, it said two individuals are not the same sex.
(-x)
exists s1 x1 x2.(n_sex(x2) & a_same(s1) & Theme(s1,x2) & n_individual(x1) & card_eq_2(x1) & -exists p1.(x1 = x2))