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Which numbers are harder to be misinterpreted

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I am implementing a multipoint bus network and i need help to chose which number are harder to be misinterpreted on a simple oversampling for clock recovery. I mean.. most of the packages will have a CRC, but ACKs, NACKs, and POLL commands wont. So i am afraid any node on the network can interpreted a ACK as a NACK or as POLL as they wont have any extra error checking. There are others safeguards as timeouts and Ids to discard duplicated messages, but i want to reduce the chance of this specific error. The commands are 8-bit long.. so which 3 8-bit long streams are harder to be misinterpreted between them?

tahnk you!
 

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