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1. My First Ruby Program
   A simple skeleton of a Ruby program.
2. String Expressions
   Simple examples of Ruby string expressions.
3. Numerical Expressions
   Simple examples of Ruby numerical expressions.
4. Conversions
   Simple examples of class conversions in Ruby.
5. Counting Loops
   Simple counting loops in Ruby.
6. Conditional Loops
   Simple conditional (while) loops in Ruby.
7. Arrays 1
   Array sorting, reversing, adding, and removing in Ruby.
8. Arrays 2
   Array iterations in Ruby.
9. Hashes
   Simple use of hashes in Ruby.
10. Functions 1
    A simple argument-less function.
11. Functions 2
    Examples of functions with arguments.
12. Yield Statement
    Using the yield statement in Ruby.
13. Here Documents
    Simple here documents in Ruby.
14. String Literals
    Escape sequences and expressions in Ruby strings.
15. Sessions
    Simple sessions use in Ruby.
16. If...Else
    If and else in Ruby.
17. Case Statement
    The case statement in Ruby.
18. Time and Date
    Using times and dates in Ruby.
19. Output Statements
    Comparing the puts and print statements in Ruby.
20. Forms
    Creating HTML forms in Ruby.
21. Setting a Cookie
    Setting a cookie in Ruby.
22. Reading a Cookie
    Reading a cookie in Ruby.

Tutorials:

1. Reserved Words
   A list of Ruby's reserved words you can't use for variable or function names.

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