Several men are sitting on their motorcycles wearing a red shirt with a black vest and black hat.
Several members of a biker gang sport their trademark red shirts, black vests and black hats.
The men sitting on their motorcycles aren't necessarily members of a biker gang. The red shirt, black vests and black hats are not necessarily their trademark clothes.
exists e1 e2 s1 s2 s3 s4 x1 x2 x3 x4 x5 x6.(for(e1,e2) & with(e2,x4) & n_hat(x6) & a_black(s4) & Theme(s4,x6) & n_vest(x5) & a_black(s3) & Theme(s3,x5) & subset_of(x6,x4) & subset_of(x5,x4) & Theme(e2,x3) & Actor(e2,x1) & v_wear(e2) & n_shirt(x3) & a_red(s2) & Theme(s2,x3) & on(e1,x2) & n_motorcycle(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_several(s1) & Theme(s1,x1))
exists s1 s2 s3 s4 s5 s6 x1 x2 x3 x4 x5 x6 x7 x8.(a_topic(x1) & of(x1,x2) & n_hat(x2) & a_black(s6) & Theme(s6,x2) & of(x2,x8) & n_vest(x8) & a_black(s5) & Theme(s5,x2) & a_,(s4) & Theme(s4,x2) & of(x2,x7) & n_shirt(x7) & a_red(s3) & Theme(s3,x2) & of(x2,x6) & n_trademark(x6) & a_their(s2) & Theme(s2,x2) & of(x2,x5) & n_sport(x5) & of(x2,x4) & n_gang(x4) & of(x2,x3) & n_biker(x3) & n_member(x1) & a_several(s1) & Theme(s1,x1))