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I'm seeking an example of a cipher construction with two variants differing by key/block/state size yet sharing most of the internal structure. Where the larger varient is easier to break than the smaller version. Should be clearly related to a well known cipher so that claiming strength of smaller varient will have merit. Bonus points for increasing also key size not just block/state. I'm aware of how this could happen, just looking for an example where it does.

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