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(
#comment
(let mr_source (DataSource 'yt 'plato))
(let x (Read! world mr_source (Key '('table (String 'Input1))) '('key 'subkey 'value) '()))
(let world (Left! x))
(let table1 (Right! x))
(let x (Read! world mr_source (Key '('table (String 'Input2))) '('key 'subkey 'value) '()))
(let world (Left! x))
(let table2 (Right! x))
(let tresh (Int32 '100))
(let result (FlatMap (Extend table1 table2) (lambda '(item) (block '(
   (let intValueOpt (FromString (Member item 'key) 'Int32))
   (let ret (FlatMap intValueOpt (lambda '(item2) (block '(
      (return (ListIf (< item2 tresh) item))
   )))))
   (return ret)
)))))
(let mr_sink (DataSink 'yt (quote plato)))
(let world (Write! world mr_sink (Key '('table (String 'Output))) result '()))
(let res_sink (DataSink 'result))
(let world (Write! world res_sink (Key) result '()))
(let world (Commit! world mr_sink))
(let world (Commit! world res_sink))
(return world)
)