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(
#comment
(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 keySelector (lambda '(x) (Member x 'value)))
(let reducedTable (PartitionsByKeys table1 keySelector (Void) (Void) (lambda '(x) x)))
(let mr_sink (DataSink 'yt (quote plato)))
(let world (Write! world mr_sink (Key '('table (String 'Output))) reducedTable '()))
(let world (Commit! world mr_sink))
(return world)
)
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