• How will you differentiate between first set of:

    - - - D

    - - - E

    and the second set of

    - - - D

    - - - E

    What makes them first or second? You need some other key as there is nothing to enforce its order...

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    "The only true wisdom is in knowing you know nothing"
    "O skol'ko nam otkrytiy chudnyh prevnosit microsofta duh!":-D
    (So many miracle inventions provided by MS to us...)

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