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A configuration of a LR parsing is: Stack Rest of Input ( S o X 1 S 1 ... X m S m , a i a i+1 ... a n $ ) S m and a i decides the parser action by consulting the parsing action table. ( Initial Stack contains just S o ) A configuration of a LR parsing represents the right sentential form: X 1 ... X m a i a i+1 ... a n $