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## This function takes the array as parameter
## Returns the array that contains the unique elements
...
    ## Finally returns the array that contains unique elements
    return @list_unique;
}

if($checker == $list){

$checker =~ /^([^\t]*\t[^\t]*)/;
$checker_part = $1;
$list =~ /^([^\t]*\t[^\t]*)/;
$list_part = $1;
if($checker_part == $list_part){