EntityQ995679· pop 9· linked from 69 articlesnested stack automatonSign in to saveConnectionsfinite-state machineEntitypushdown automatonEntityregular languageEntityembedded pushdown automatonEntityInternational Standard Book NumberEntitydigital object identifierEntitygroupEntityTuring machineEntitysubsetEntityQ118398EntitystackEntityformal languageEntityautomata theoryEntityChomsky hierarchyEntityQ22908627EntityAlfred AhoEntityformal grammarEntitycontext-free grammarEntityKleene starEntityconcatenationEntityCategoriesAutomata (computation)Models of computation