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d.itervalues() -> iter(d.values())

d.viewkeys() -> d.keys()
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d.viewvalues() -> d.values()

Except in certain very specific contexts: the iter() can be dropped
when the context is list(), sorted(), iter() or for...in; the list()
can be dropped when the context is list() or sorted() (but not iter()
or for...in!). Special contexts that apply to both: list(), sorted(), tuple()
set(), any(), all(), sum().

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