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Yampa/pSwitch

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pSwitch :: Functor col
        => (forall sf. (in -> col sf -> col (ext, sf)))
        -> col (SF ext out)
        -> SF (in, col out) (Event mng)
        -> (col (SF ext out) -> mng -> SF in (col out))
        -> SF in (col out)

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Yampa switches

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