RIESI, Bureaucrats, Administrators
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[http://karnatakaeducation.org.in/KOER/en/images/a/ab/Rain_and_thunder_%2801%29.ogg test]
[http://karnatakaeducation.org.in/KOER/en/images/a/ab/Rain_and_thunder_%2801%29.ogg test]
[File:https://phet.colorado.edu/sims/html/equality-explorer-two-variables/latest/equality-explorer-two-variables_en.html]