(
#comment
(let config (DataSource 'config))

(let res_sink (DataSink 'result))
(let data (AsList
  (AsStruct '('data (String 'a)))
  (AsStruct '('data (String 'b)))
  (AsStruct '('data (String 'c)))
))

(let one (OrderedFlatMap data (lambda '(x) (AsList x (AsStruct '('data (String 'z)))))))
(let two (OrderedFlatMap one (lambda '(x) (AsList (AsStruct '('data (String 'y))) x x))))
(let three (OrderedFlatMap two (lambda '(x) (AsList x (AsStruct '('data (String 'x))) x))))
(let world (Write! world res_sink (Key) three '('('type))))
(let world (Commit! world res_sink))
(return world)
)