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(
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
(import id_module '"/lib/yql/id.yql")
(let id (bind id_module 'id))
(let list (AsList (String 'a) (String 'b) (String 'c)))
(let res_sink (DataSink 'result))
(let world (Write! world res_sink (Key) (ForwardList (Iterator list (DependsOn (Int32 '0)))) '('('type))))
(let world (Write! world res_sink (Key) (ForwardList (Apply id (Iterator list (DependsOn (Int32 '1))))) '('('type))))
(let world (Write! world res_sink (Key) (Fold (ForwardList (Apply id (Iterator list (DependsOn (Int32 '2))))) (String '"")
(lambda '(item state) (Concat item state))) '('('type))))
(let world (Write! world res_sink (Key) (Fold1 (ForwardList (Apply id (Iterator list (DependsOn (Int32 '3)))))
(lambda '(item) item)
(lambda '(item state) (Concat item state))) '('('type))))
(let world (Write! world res_sink (Key) (FlatMap (ForwardList (Apply id (Iterator list (DependsOn (Int32 '4)))))
(lambda '(item) (AsList item item))) '('('type))))
(let world (Write! world res_sink (Key) (FoldMap (ForwardList (Apply id (Iterator list (DependsOn (Int32 '5))))) (String '"")
(lambda '(item state) '((Concat item state) (Concat item state)))) '('('type))))
(let world (Write! world res_sink (Key) (Fold1Map (ForwardList (Apply id (Iterator list (DependsOn (Int32 '6)))))
(lambda '(item) '(item item))
(lambda '(item state) '((Concat item state) (Concat item state)))) '('('type))))
(let world (Commit! world res_sink))
(return world)
)
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