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(
#comment
(let mr_source (DataSource 'yt 'plato))
(let filter (lambda '(name) (And (>= name (String '"Input1")) (<= name (String '"Input3")))))
(let x (Read! world mr_source (Key '('table (MrTableRangeStrict '"" filter))) (Void) '()))
(let world (Left! x))
(let tables (Right! x))
(let length (Length tables))
(let mr_sink (DataSink 'yt (quote plato)))
(let world (Write! world mr_sink (Key '('table (String 'Output))) (Just (AsStruct '('value length))) '()))
(let res_sink (DataSink 'result))
(let world (Write! world res_sink (Key) length '()))
(let world (Commit! world mr_sink))
(let world (Commit! world res_sink))
(return world)
)
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