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📚 The CoCalc Library - books, templates and other resources

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1
Prelude> head []

2
*** Exception: Prelude.head: empty list

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Prelude> tail []

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*** Exception: Prelude.tail: empty list

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Prelude> tail [1]

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[]

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Prelude> head [1]

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1

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Prelude> null []

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True

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Prelude> null [[]]

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False

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