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;