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(
#comment
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
(let res_sink (DataSink 'result))
(let outLambda (lambda '(sep) (block '(
(let data (AsList (String 'a) (String 'b)))
(let data1 (Map data (lambda '(x) (Concat x sep))))
(let data2 (Map data (lambda '(y) (Concat y sep))))
(let res (Extend data1 data2))
(return res)
))))
(let predicate (== (Int32 '1) (Int32 '2)))
(let sep (If predicate (Just (String '_)) (Just (String '+))))
(let data (IfPresent sep outLambda (AsList (String 'none))))
(let world (Write! world res_sink (Key) data '()))
(let world (Commit! world res_sink))
(return world)
)
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