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I was always told that the sequence for a non-unique key could not be 
guaranteed for the reason of access path sharing - OS/400 will find an 
access path which already exists & that matches the specified keys. The 
one it finds may have an additional key, i.e. you want keylist A B, 
existing access path has A B C, you'll get the records in A B C order even 
though you only need them in A B order.

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