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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 table1map (FlatMap table1 (lambda '(item) (block '(
(let value (Member item 'value))
(let newValue (AsList value))
(let newValue (Prepend (String 'p) newValue))
(let newValue (Append newValue (String 'a)))
(let ret (Map (Skip newValue (Uint64 '1)) (lambda '(item) (block '(
(let s (Struct))
(let s (AddMember s 'key (String '.)))
(let s (AddMember s 'subkey (String '.)))
(let s (AddMember s 'value item))
(return s))))))
(return ret)
)))))
(let mr_sink (DataSink 'yt (quote plato)))
(let world (Write! world mr_sink (Key '('table (String 'Output))) table1map '('('mode 'append))))
(let world (Commit! world mr_sink))
(return world)
)
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