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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 data (AsList 
(AsStruct '('key (String 'key1)) '('subkey (String '"")) '('value (String 'value1)))
(AsStruct '('key (String 'key2)) '('subkey (String '"")) '('value (ToString (Length table1))))
))
(let mr_sink (DataSink 'yt (quote plato)))
(let world (Write! world mr_sink (Key '('table (String 'Output))) data '('('mode 'append))))
(let world (Commit! world mr_sink))
(return world)
)