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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 data (Fold list
  (String 'z)
  (lambda '(item state) (Max state (String 'y)))))
(let res_sink (DataSink 'result))
(let world (Write! world res_sink
    (Key)
    data '()))

(let world (Commit! world res_sink))
(return world)
)