static L<S> splitIntoSentences_v1(S s) {
  ret splitIntoSentences_v1_tok(nlTok3(s));
}

static L<S> splitIntoSentences_v1_tok(L<S> s) {
  int i = 0;
  new L<S> l;
  while (i <= l(s)) {
    int j = smartIndexOf(s, ".", i)+1;
    addIfNempty(l, trim(join(subList(s, i, j))));
    i = j;
  }
  ret l;
}