Simple cartesian product

[Skip Montanaro]

    Magnus> Thomas Wouters <thomas at xs4all.net> writes:
    >> So is this YYYY-MM-DD or YYYY-DD-MM ?
    Magnus> yyyy-mm-dd

    Magnus> Logical, considering other formats like hh:mm:ss, and decimal
    Magnus> numbers in general.

Yes, even more logical considering the fact that sorting a file using
ISO-8601 dates will actually sort the file into proper ascending or
descending order.

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