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| function powerset (input) { | |
| return input | |
| .split(input ? '' : false) | |
| .filter(duplicates({})) | |
| .map(concatEmptyStr) | |
| .reduce(multiplyMatrix) | |
| } | |
| function concatEmptyStr (str) { | |
| return str ? ['', str] : [''] |
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