Power set: Difference between revisions

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→‎{{header|Wren}}: Correction to preamble.
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=={{header|Wren}}==
Although we have a module for sets, they are based on maps whose keys must be value types. This means that sets of sets are technically impossible because setsets elementsthemselves are not value types.
 
We therefore use lists to represent sets which works fine here.
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