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Key  Value

...
PR2  4
PR3  1
PR4  3

$input = &process1 ($input)
$input = &process2 ($input)
$input = &process3 ($input)
$input = &process4 ($input)

The way i tried one way (here i have changed subroutine name as per th
+e key in the hash, which i don't want):

...
 
    $input = &$_ ($input); 
}

The second way i tried but not correct (just i gave a try):

...


}