If I read your question correctly, it is very simple: 
   $x = $hash{$valuem};

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The solution you provided implies: a hash with the key 'mainKey', whose value is a reference to a hash with the key in $valueM, whose value is a reference to a hash with the key 'key'.

In reply to Re: Algorithmic hash bug. by cdarke
in thread Algorithmic hash bug. by thenetfreaker

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