People, I define, for example, tuple42 (_, y, _, _) = y, setTuple42 (x, _, z, u) y = (x, y, z, u), mapTuple42 f (x, y, z, u) = (x, f y, z, u). But it looks natural to have such functions for tuples in the library. As Haskell-2010 has zip3, zip4 ..., where are the library functions tupleij, setTupleij, mapTupleij, say, for i, j <- [2 .. 6] ? I expected to find in the Report "Data.Tuple" similar as "Data.List", but do not. GHC has "Data.Tuple", but it misses the above functions. Thank you in advance for your comments, ----------------- Serge Mechveliani mechvel@botik.ru