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    if( substr($v1, 0, 2) eq substr($v2, 0, 2) )
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    if( (substr($v1, 0, 3) eq substr($v2, 0, 3) ) && 
    substr($v1, 1 ,1) eq '.' && substr($v2, 1 ,1) eq '.' )
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    if( substr($v1, 0, 3) eq substr($v2, 0, 3) )