static L<ES> ai_spaceToSpace_es(S space1, S space2, Collection<ES> inputs, O... _) {
  ret map(s -> ai_spaceToSpace_es(space1, space2, s, _), inputs);
}

static ES ai_spaceToSpace_es(S space1, S space2, ES input, O... _) {
  S userName = optPar userName(_, 'usery);
  S computerName = optPar computerName(_, 'computery);
  if (eq(space1, 'user) && eq(space2, 'objective))
    ret extTrans ai_spaceToSpace(input, switcheroo_youToName(computerName, switcheroo_iToName(userName, input!)));
  if (eq(space1, 'objective) && eq(space2, 'computer))
      ret extTrans ai_spaceToSpace(input, switcheroo_nameToYou(userName, switcheroo_nameToI(computerName, input!));
    ret input;
}

Began life as a copy of #1023190