Correct typos in Ping's email address.
Remove premature use of negative indexes in string operation examples; negative indexes have not been explained at that point, and the use of negative indexes are not necessary for the examples.
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@ -620,7 +620,7 @@ indexed position in the string results in an error:
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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TypeError: object doesn't support item assignment
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>>> word[:-1] = 'Splat'
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>>> word[:1] = 'Splat'
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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TypeError: object doesn't support slice assignment
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@ -632,7 +632,7 @@ efficient:
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\begin{verbatim}
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>>> 'x' + word[1:]
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'xelpA'
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>>> 'Splat' + word[-1:]
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>>> 'Splat' + word[4]
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'SplatA'
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\end{verbatim}
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@ -1645,7 +1645,7 @@ An example that uses most of the list methods:
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\subsection{Using Lists as Stacks \label{lists-as-stacks}}
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\sectionauthor{Ka-Ping Yee}{ping@lfs.org}
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\sectionauthor{Ka-Ping Yee}{ping@lfw.org}
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The list methods make it very easy to use a list as a stack, where the
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last element added is the first element retrieved (``last-in,
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@ -1673,7 +1673,7 @@ first-out''). To add an item to the top of the stack, use
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\subsection{Using Lists as Queues \label{lists-as-queues}}
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\sectionauthor{Ka-Ping Yee}{ping@lfs.org}
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\sectionauthor{Ka-Ping Yee}{ping@lfw.org}
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You can also use a list conveniently as a queue, where the first
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element added is the first element retrieved (``first-in,
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