On the other hand it can be useful to initialise values, especially global ones, with a default value, so that if you need to debug later you could print out the variable to see if it changes.
my ($title, $page, $chapter) = "somethingglobal";
my $title = "somethingelocalhere";
Also if you declare and initialise at the start of the program or of each sub, it is easier to read and maintain the code, especially to non-perl programmers.
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