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

(let table1 (Map table1 (lambda '(x) (AddMember x 'foo (String 'qwe)))))
(let table1 (Take table1 (Uint64 '2)))
(let res_sink (DataSink 'result))
(let world (Write! world res_sink
    (Key)
    table1 '()))

(let world (Commit! world res_sink))
(return world)
)