AV2 version

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We make the improvement by adding a theory learning for the chosen subtopic. We will re-edit the explanations for each topic so the connection between each topics will become more clear. We will upload it later. Please comment #(^_____^)#

There was a comment about limited comment place to send, so we already made the improvement by enabling the comment area. \(>.<)/ P.S : There are more AV2 to post, please wait.