Two boys dressed in purple shirts sit and smile while leaning against a picket fence.
Two friends sitting after school.
There is nothing to imply that the two boys are friends. They could be complete strangers sitting at opposite ends of the fence, for example. Also, there is no way to know if either boy was at school, let alone both of them.
exists e2 e3 e1 e4 e5 s1 x1 x2 x3 x4 x5 x6 x7.(while(e4,e5) & against(e5,x6) & n_fence(x6) & of(x6,x7) & n_picket(x7) & Actor(e5,x1) & v_lean(e5) & Actor(e4,x1) & v_smile(e4) & while(e2,e3) & against(e3,x4) & n_fence(x4) & of(x4,x5) & n_picket(x5) & Actor(e3,x1) & v_lean(e3) & Actor(e2,x1) & v_sit(e2) & in(e1,x3) & n_shirt(x3) & a_purple(s1) & Theme(s1,x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_boy(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & after(e1,x3) & n_school(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_friend(x1) & card_eq_2(x1))