Baseball pitcher and catcher discussing
Baseball pitcher and catcher talking
Talking and discussing are synonyms.
exists s1 x1 x2 x3 x4.(n_discuss(x2) & of(x2,x4) & n_catcher(x4) & n_pitcher(x1) & of(x1,x3) & n_baseball(x3) & subset_of(x2,s1) & subset_of(x1,s1) & a_topic(s1))
(x)