A little boy in red shorts, a boy in a black Speedo, and a boy in gray shorts are all running on the beach.
Three boys are running on the beach.
The boys being running on the beach is restated. Rather than imply that there's three boys by stating their various attire, this just says three boys are running.
exists e1 s1 s2 s3 s4 s5 x1 x2 x3 x4 x5 x6 x7 x8.(n_beach(x8) & a_all(s5) & Manner(e1,s5) & on(e1,x8) & Actor(e1,x1) & v_run(e1) & subset_of(x6,x1) & in(x6,x7) & n_shorts(x7) & a_gray(s4) & Theme(s4,x7) & n_boy(x6) & subset_of(x2,x1) & in(x2,x3) & rel(x3,x4) & in(x4,x5) & n_speedo(x5) & a_black(s3) & Theme(s3,x5) & n_boy(x4) & n_shorts(x3) & a_red(s2) & Theme(s2,x3) & n_boy(x2) & a_little(s1) & Theme(s1,x2))
exists e1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_run(e1) & n_boy(x1) & card_eq_3(x1))