Please take a look at the approach ikegami has provided and also at the approaches discussed in answer to the startlingly similar question posed in Need some help building a data structure. and tell us how they do or do not serve your purpose. Knowing this, we may be better able to advise on the most effective approach.

In reply to Re: HoH..oA data structure by AnomalousMonk
in thread HoH..oA data structure by Anonymous Monk

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