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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. Class 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. Array Methods
   Array sorting, reversing, adding, and removing in Ruby.
8. Array Loops
   Array iterations in Ruby.
9. Hashes
   Simple use of hashes in Ruby.
10. Functions
    Examples of simple Ruby functions
11. The if Statement
    If and else statements in Ruby.
12. Yield Statement
    Using the yield statement in Ruby.
13. Here Documents
    Simple here documents in Ruby.
14. The case/when Statement
    Example of the case/when statement in Ruby.
15. Time and Date
    Using times and dates in Ruby.
16. Setting a Cookie
    Setting a cookie in Ruby.
17. 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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