A youth on a bicycle wearing a white sweater riding along a wall.
a kid on a bike riding along a wall
A youth is a kid and being on a bicycle means riding a bike.
exists e1 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & on(x1,x2) & along(e1,x6) & n_wall(x6) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_riding(x4) & of(x4,x5) & n_sweater(x5) & a_white(s1) & Theme(s1,x4) & (x2 = x3) & n_bicycle(x2) & n_youth(x1))
exists x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & along(x2,x4) & n_wall(x4) & n_riding(x2) & of(x2,x3) & n_bike(x3) & n_kid(x1))