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  1. or download this
    my %hash1; #Hash for stuff
my %hash2468; #hash for even nos
my@blahblah;     # Is this even necessary?
my %someOtherKindOfHash;   # Maybe stuff here
my %h3; #you might want this hash, too.
  2. or download this
    # Predeclared hashes. Used throughout the script.
my %hashForStuff;
...

# Is this even necessary?
# my @blahblah;
  3. or download this
    if (isValidValue($num)) {
    # Do stuff here.
}

return undef unless isValidValue($num2);