People are dressed in costumes while on a boardwalk.
People are swimming naked
The subjects cannot be naked and dressed at the same time.
exists e1 x1 x2 x3.(on(e1,x3) & n_boardwalk(x3) & r_while(e1) & in(e1,x2) & n_costume(x2) & Theme(e1,x1) & v_dress(e1) & n_people(x1))
exists e1 p1 x1.(exists s1.(Theme(s1,x1) & a_naked(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_swim(e1) & n_people(x1))