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my %hash1 = (
...
        key3 => '',
        key4 => 4
);

$hash1{key1}
$hash1{key2}{key22}
$hash1{key2}{key23}

my %hash2 = (
        key1 => "$home_path/relative_path",
...
        key3 => '',
        key4 => 4
);

@list = ('key1','key2:key22','key2:key23');