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Do that the iPad air 2 can't on iOS 9?
What is with all these posts? A little use of Google will find you a lot of answers. The iPad 4 cannot do anything that the iPad Air 2 cannot. Your question makes no sense.
 
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What's with all the questions? If you looked into your question for a fraction of a second, you'd find lots of answers, the most notable of which would be: run Split View.
 
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