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The article discusses the importance of FIRST and FOLLOW sets in syntax analysis. First, the compiler can determine the first character of a string produced when a production rule is applied, allowing it to make a wise decision on which rule to apply. For example, if the compiler knew the first character of the string produced by a production rule, it could apply the correct rule to get the correct syntax tree for the given input string. Second, FOLLOW can make a Non-terminal vanish out if needed to generate the string from the parse tree. In this case, the parser applies the rule B - ε, which vanishes the first character of the input string, resulting in the string "ab". Therefore, it is crucial to find FIRST and FOLLOW sets for a given grammar to ensure proper application of the required rule at the correct position.


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