a young boy in jeans and a blue shirt is wearing a blue helmet.
A young boy is wearing a red shirt and a green helmet.
A boy can't be wearing a red shirt and a blue shirt at the same time.  The boy also can't be wearing two different colored helmets.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5.(Theme(e1,x5) & Actor(e1,x1) & v_wear(e1) & n_helmet(x5) & a_blue(s3) & Theme(s3,x5) & subset_of(x4,x1) & n_shirt(x4) & a_blue(s2) & Theme(s2,x4) & subset_of(x2,x1) & in(x2,x3) & n_jeans(x3) & n_boy(x2) & a_young(s1) & Theme(s1,x2))
exists e1 s1 s2 s3 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & subset_of(x4,x2) & n_helmet(x4) & a_green(s3) & Theme(s3,x4) & subset_of(x3,x2) & n_shirt(x3) & a_red(s2) & Theme(s2,x3) & n_boy(x1) & a_young(s1) & Theme(s1,x1))