Your solution only matches if the line at the same line number in both files is the same. The OP was attempting to match each line in file1 against each line in file2. For the files listed below only the first line is matched even though there are four lines that match.
File1.txt:
item1
item2
item3
item4
File2.txt:
item1
abc
item2
item3
item4
File3.txt:
item1
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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