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#sliding - 0 1 2 3 4 5 6 7 8 9
# A B C D E F G H I J
# -10-9-8-7-6-5-4-3-2-1
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letters =["A","B","C","D","E","F","G","H","I","J"]
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letters
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letters[:]
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letters[2:]
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letters[:7]
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letters[2:7]
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letters[-8:7]
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letters[-8:-3]
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#advance sliding
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letters[:]
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letters[2:9]
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letters[2:9:2]
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letters[2:9:3]
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letters[::3]
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letters[::-9]
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