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(
(let mr_source (DataSource 'yt 'plato))
(let x (Read! world mr_source (Key '('table (String 'Input))) '('key 'subkey 'value) '()))
(let world (Left! x))
(let table1 (Right! x))

(let table1 (Map ("/" (Int32 '42) (Int32 '1)) (lambda '(item) (AsStruct
  '('magic (Just item))
  '('black_magic ("/" (Int32 '100) item))
  ))))

(let table1 (SelectMembers table1 '('m)))

(let res_sink (DataSink 'result))
(let world (Write! world res_sink (Key) table1 '('('type))))
(let world (Commit! world res_sink))
(return world)
)