Perhaps: NB. http://office.microsoft.com/en-us/excel-help/excel-specifications-and-limits-HP010342495.aspx cnam=:3 :0 seg=. <:+/\}.26^i.4 grp=. seg I. y abc=.'ABCDEFGHIJKLMNOPQRSTUVWXYZ' (-1+grp){."_1 abc {~ (#abc) #.inv y-grp{seg+1 )
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