2013 Microsoft Intern Hiring Written Test : 20
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20. Aparticular BNF definition for a “word” is by the following rules (13 Points)
<word> ::= <letter> | <letter><pairlet>| <letter><pairdig>
<pairlet> ::= <letter><letter> |<pairlet><letter><letter>
<pairdig> ::= <digit><digit> |<pairdig><digit><digit>
<letter> ::= a | b | c | … | y | z
<digit> ::= 0 | 1 | 2 | … | 9
Which of the following lexical entities can be derivedfrom <word> ?
I. abcd II. bcdef III. d22
A. None
B. I and II only
C. I and III only
D. II and III only
E. I, II and III
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