283 #2

use Test;

sub validate(@values) {
    my %counters = @values.classify(*.self);
    for %counters.values {
        $_ = .elems
    }
    for @values.kv -> UInt $i, UInt $v {
        return False unless $v == %counters{$i}
    }
    True
}

ok (1, 2, 1, 0).&validate;
ok !(0, 3, 0).&validate;