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(
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
(let list (AsList (String 'a) (String 'b) (String 'c)))
(let keyExtractor (lambda '(x) (String '"@")))
(let handler (lambda '(key list) (AsList '(key (Length list)))))
(let data (GroupByKey list keyExtractor handler))
(let res_sink (DataSink 'result))
(let world (Write! world res_sink
(Key)
data '()))
(let world (Commit! world res_sink))
(return world)
)
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