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1. My First Perl Program
   A simple skeleton of a Perl program.
2. Environment Variables
   List and values of environment variables.
3. Basic Operators
   A few Perl basic operators.
4. Loops
   A few examples of counting and conditional loops.
5. Date & Time Functions
   Simple uses of the localtime and gmtime functions.
6. Arrays
   A few basic array manipulations in Perl.
7. Sorting Arrays
   Sort operations on arrays in Perl.
8. CGI Library, Ranges & Enumerations
   A few examples on how to use the CGI.pm library and how to define loops with ranges and enumerations.
9. Substrings
   Creating substrings with the substr function.
10. String Concatenation
    String concatenations demonstration.
11. Subroutines
    A simple example of a subroutine with one argument.
12. Hashes
    Simple examples with Perl hashes.
13. Data Analysis
    Data analysis with Perl regular expressions.
14. Regular Expressions
    A few examples of Perl regular expressions.
15. Formatted Output
    Numerical formatted output in Perl.
16. Trigonometric Functions
    A few examples of Perl's built-in trigonometric functions.

Tutorials:

1. Uploading Files Using CGI and Perl
   A detailed tutorial on how to write a script for a user to upload files to a server using the web browser.
2. Perl Regular Expressions Tutorial
   A complete tutorial on regular expressions in Perl.
3. Regular Expressions in Perl - Reference
   A tabular summary of the regular expressions syntax in Perl with annotated examples.

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