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regular-expressions × 61fl.formal-languages × 29
automata-theory × 21
regular-language × 17
dfa × 8
reference-request × 7
cc.complexity-theory × 5
complexity-classes × 3
pl.programming-languages × 3
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lower-bounds × 2
lg.learning × 2
parsing × 2
np-hardness × 1
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approximation-algorithms × 1
optimization × 1
turing-machines × 1
communication-complexity × 1
tree × 1
algebra × 1
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parameterized-complexity × 1
terminology × 1