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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static <A> L<A> minus(Collection<A> a, O... b) {
  Set set = asSet(b);
  new L l;
  for (O s : unnull(a))
    if (!set.contains(s))
      l.add(s);
  ret l;
}

static BigInteger minus(BigInteger a, BigInteger b) {
  ret a.subtract(b);
}

ifclass Complex
static Complex minus(Complex c) {
  ret c == null ?: complex(-c.re(), -c.im());
}
endif