A group of men on a boat that is tipped wearing helmets.
A bunch of guys are on a boat.
group of men is a rephrasing of bunch of guys.
exists e1 p1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & on(x2,x3) & exists e2 x5.(Theme(e2,x5) & Actor(e2,x4) & v_wear(e2) & n_helmet(x5)) & Recipient(e1,p1) & Topic(e1,x4) & v_tip(e1) & (x3 = x4) & n_boat(x3) & n_man(x2) & n_group(x1))
exists p1 x1 x2.(exists x3.(on(x1,x3) & n_boat(x3)) & of(x1,x2) & n_guy(x2) & n_bunch(x1))