Why it matters

Grammar compression enables queryable compression. Understanding shapes text indexing.

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The architecture

Find repeats + replace with production rules.

Recursive process.

Grammar generates original.

Grammar compression flowFind repeatsdigraph pairsIntroduce productionrule per repeatGrammargenerates originalSequitur online; RePair batch; foundation for repetitive compression
Grammar compression.
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How it works end to end

Sequitur (Nevill-Manning + Witten).

RePair (Larsson + Moffat).

Repetitive text especially.