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7-11 Stair Argument Weak To the Editor: I would like to comment on the letter in reference to the "7-11" stair rule ("Steep Stair Blues," Letters, 4/93). I attended the BOCA convention in 1983 in Grand Rapids, Mich., where 7-11 was the main topic, and so had the opportunity to listen to the testimony of the proponents. My honest impression is that the data supporting 7-11 is, at best, totally inconclusive and doesn't prove that stair steepness is an overriding factor in stair accidents. At worst, the supporting data is a wild conclusion extrapolated from unsorted data from some hospital emergency room accident reports — in essence a case of making the "facts" fit the predetermined conclusion. I know from experience that