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Permuterm index
For term hello, index under:
hello$, ello$h, llo$he, lo$hel, o$hell
where $ is a special symbol.
Queries:
X lookup on X$ X* lookup on $X*
*X lookup on X$* *X* lookup on X*
X*Y lookup on Y$X* X*Y*Z ??? Exercise!
↑
Query = hel*o
X=hel, Y=o
Lookup o$hel*
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