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protocol
mastery UK /ˈpɹəʊtəˌkɒl/ US /ˈpɹoʊtəˌkɑl/nounverb
card 1 of 10 · fill in the blank
The _____ protocol required all delegates to shake hands before entering the conference room.
card 1 of 10 · fill in the blank
The _____ protocol required all delegates to shake hands before entering the conference room.