multidimensional ragged arrays

multidimensional ragged arrays

http://dl.dropbox.com/u/3595000/work/jq/t2.htm
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Why is this essentially random under refreshing (in ff3.6 & Chrome 1b)?
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Assuming it can be made deterministic ...  the goal is to find selectors for this type of dictionary that would, eg, select all 3rd letter a's followed by t's...
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Although this is a small dict a larger dict eg the Scrabble dict is envisioned - and it must be fast and deterministic.