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#234567890123456789012345678901234567
$"='';grep{/^(([@_])(?!.*\2))+$/}<D>;
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    #234567890123456789012345678901234567
$"='';grep/^(([@_])(?!.*\2))+$/,<D>;
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+         8
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+12345678901
$"='';$n{$_}++for@_;grep/^((??{"([@_])"})(??{"(?!([^$1 ]*$1){$n{$1},})
+"}))+$/,<D>
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    $"='';$n{$_}++for@_;grep/^(([@_])(??{"(?!([^$1 ]*$1){$n{$1},})"}))+$/,
+<D>