svoid test_WordTokReplacerWithSecondIn() {
  WordTokReplacerWithSecondIn rule = new(
    "who is x", ll("x", "y"), "x is y", ll("x is y of course")
  );
  assertTrueVerbose(rule.matches("who is john"));
  L<Attractor> newRules = instancesOf Attractor(getEmits(rule));
  assertEqualsVerbose(1, l(newRules));
  assertEqualsVerbose(litciset("john is cool of course"), applyAttractors(newRules, "john is cool"));
}