This memorial is to remember victims of a tragedy.
A gravesite of a single individual
victims is plural therefore can not mean a single individual
exists e1 p1 x1.(n_memorial(x1) & Topic(e1,p1) & Actor(e1,x1) & v_be(e1) & exists e2 x2 x3.(Theme(e2,x2) & Actor(e2,x1) & v_remember(e2) & of(x2,x3) & n_tragedy(x3) & n_victim(x2)))
exists s1 x1 x2.(a_topic(x1) & of(x1,x2) & n_individual(x2) & a_single(s1) & Theme(s1,x2) & n_gravesite(x1))