Question: Consider the following grammar. S ::= a B b | b C a B ::= a B | B b | D C ::= b

Consider the following grammar. S ::= a B b | b C a B ::= a B | B b | D C ::= b C | C a | D D ::= x

Which of the following strings can NOT be generated by the grammar?

1. aabx

2. aaxbbb

3. aaabxbb

4. bbxaaaa

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