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In other words, anytime Responder bids 3m-after-Stayman( and Opener's reply), he DOES promise a four-card Major.
Still on SAYC:
To show clubs ONLY
1NT-3C = invite
1NT-2S(relay)3C = weak
1NT-2C-2whatever-3C = slam invite
How else (still by SAYC) are you going to bid a slam zone hand with a minor but no 4-card major?
I am not trying to say this is best, but it "is" what SAYC prescibes.