On the other hand I will never rebid 1NT with a stiff, unless it is on the unbid suit, meaning partner can easylly find the 5-3 fit in his major.
I say never, but actually once I had the hand that had to rebid 1NT with a stiff Ace on partner's suit and very strong on the other major as a couple of hands posted here, it was horrible result to play in the 5-1

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