bip44 account discovery

bip44 account discovery

In Bip44 "Account Discovery" section, there is following sentence:

We scan just the external chains, because internal chains receive only coins that come from the associated external chains. (http://ift.tt/1OgyDI4)

I do not understand it. If I do not scan internal chain, how will I find the change addresses? Yes, change address will exist in transaction output of public (external) addresses, but I can not find out which output address is change address as it can be real receiver address. Thanks for help.

http://ift.tt/2BQaYUI

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