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java.lang.StackOverflowError: 	at$3ReducingSink.begin(Unknown Source)	at$ChainedReference.begin(Unknown Source)	at$2$1.begin(Unknown Source)	at Source)	at Source)	at$ReduceOp.evaluateSequential(Unknown Source)	at Source)	at Source)	at	at	at	at	at	at	at	at	at	at