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Eloquent Ruby: Exploring bang.
Eloquent Ruby: hashes are really ordered in 1.9
Eloquent Ruby - Chapter 3: clean up statement to use string interpolation
Eloquent Ruby - Chapter 4: negative indexing with strings.
Eloquent Ruby - Chapter 5: regular expression matching
Eloquent Ruby - Chapter 6: playing with symbols
Eloquent Ruby - Chapter 7: it's objects all the way down.
Eloquent Ruby - Chapter 8: Ducks, ducks, ducks