static int ai_splitTwoNounPhrasesByCase(L<S> tok1) {
  ret ai_splitTwoNounPhrasesByCaseC(codeTokens(tok1))*2;
}

// tok = code tokens
static int ai_splitTwoNounPhrasesByCaseC(L<S> tok) {
  L<Bool> l = map(f startsWithUpperCase, tok);
  ret indexOfFirstChange(l);
}