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Me too, so I'm just going to say that it was a reasonable assumption for the US that the Tu-22M Backfire was a modified version of the Tu-22 Blinder, because an "M" usually designates a modification, while the Tu-22M was in fact a completely new aircraft because it was more convenient for the Tupolev design bureau to give the aircraft an "M" designation than to treat it as a new aircraft entirely.