How tx are grouped in the block

As we mostly know, Merkel tree is the Blockchain Tech of Ethereum and NEO, where each Block has a Merkel Root, and every transaction is hashed in one of the nodes of the root. So what is NEM using as a based Technology for grouping Transactions on the block? I read around and could’nt find anything. maybe my Google or reading skills are totally crap.

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I don’t know of a single chain that doesn’t use merkle trees and I’d be really surprised if nem didn’t use them.

Yes a good point, Hashgraph doesn’t appear to, but I was asking because I can not find any confirmation of the fact in the docs.