Here's my answers for ps5. first portion: http://dpaste.com/hold/555367/ ghost game: http://dpaste.com/hold/555368/ I worked around the "do not mutate" problem by creating an identical list to mutate.
dictionaries have a copy method: http://docs.python.org/library/stdtypes.html#mapping-types-dict
Oh ok. Thanks :)
It makes a shallow copy which I think is ok for this use.
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