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my %g = (
    k => [8, 2, 10, 2, 1, 3], 
    l => [10, 7, 9, 0, 1]
);

use 5.014; 
no warnings; # some non-sensical combination of sigils would give warn
+ings
...
    } 
}
__END__

length ~$~#g{k}

length {}%$g{k}
length {}%@g{k}
length {}-$g{k}
length {}-@g{k}