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Richland Township, located in historic Bucks County, was settled around 1710 by Welsh Quakers who used European farming methods to turn the swamp into rich farmland. Prior ro the Civil War, residents played key roles in hiding the Liberty Bell, Fries Rebellion, and the Underground Railroad. The first settlement grew around the Richland Friend s Meeting House and was incorporated as Quakertown Borough in 1855. Another village, Richlandtown, was a center of religious and commercial life. Richland Township remained mainly agricultural during the first half of the 20th century, while...

The study of formal languages and of related families of automata has long been at the core of theoretical computer science. Until recently, the main reasons for this centrality were connected with the specification and analy sis of programming languages, which led naturally to the following ques tions. How might a grammar be written for such a language? How could we check whether a text were or were not a well-formed program generated by that grammar? How could we parse a program to provide the structural analysis needed by a compiler? How could we check for ambiguity to en sure that a...