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http://www.stanford.edu/~mjockers/limited/Exercises/exercise1.html
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http://www.stanford.edu/~mjockers/limited/Exercises/exercise2.html
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http://www.stanford.edu/~mjockers/limited/Exercises/exercise3.html
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http://www.stanford.edu/~mjockers/limited/Exercises/exercise4.html
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http://www.stanford.edu/~mjockers/limited/Exercises/exercise5.html
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http://www.stanford.edu/~mjockers/limited/Exercises/exercise6.html
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http://www.stanford.edu/~mjockers/limited/Exercises/exercise7.html
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http://www.stanford.edu/~mjockers/limited/Exercises/exercise8.html