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Mixed Oracle Dataguard version 10gR2 and 11gR2

Hi.
My Friends.

I have the following question? 

Is it possible have oracle dataguard mixed version of oracle database software? 
--> Primary Database: Oracle Database 10gR2 10.2.0.4.0 64 bits OS: HP-UX Itanium 11.31
--> Physical Standby: Oracle Database 11gR2 11.2.0.3 64 bits OS: HP-UX PARISC 11.31 or 11.23

What suggest for this operation.

Greetings.

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