Пример #1
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def identity_monad():
    return monad(identity_functor, identity, identity)
Пример #2
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def error_monad():
    return monad(error_functor, join, unit)
Пример #3
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def list_monad():
    return monad(list_functor, join, unit)
Пример #4
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def none_monad():
    return monad(none_functor, join, unit)
Пример #5
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def maybe_monad():
    return monad(maybe_functor, join, unit)