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The four parts of a grammar are:
1. An alphabet N of grammar symbols called nonterminals.
2. An alphabet T of symbols called terminals. The terminals are distinct from the nonterminals.
3. A specific nonterminal S, called the start symbol.
4. A finite set of productions.
In the following grammar, which of the four parts of a grammar is b?
S → Λ | aB
B → b | bB