How to union nested Sets / A single set from nested sets?

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Subject	How to union nested Sets / A single set from nested sets?
Date	Mon, 04 Jan 2016 04:40:03 +0200
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I'm forming sets by set.adding to sets and this leads to sets such as:

Set([ImmutableSet(['a', ImmutableSet(['a'])]), ImmutableSet(['b', 
'c'])])

Is there way union these to a single set, i.e. get

Set(['a', 'b', 'c'])

?

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Thread

How to union nested Sets / A single set from nested sets? mviljamaa <mviljamaa@kapsi.fi> - 2016-01-04 04:40 +0200
  Re: How to union nested Sets / A single set from nested sets? Rustom Mody <rustompmody@gmail.com> - 2016-01-06 08:19 -0800
  Re: How to union nested Sets / A single set from nested sets? Grobu <snailcoder@retrosite.invalid> - 2016-01-07 05:59 +0100
    Re: How to union nested Sets / A single set from nested sets? Joel Goldstick <joel.goldstick@gmail.com> - 2016-01-07 00:33 -0500

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