part a of the question says to prove this is not a context free grammer while part b says to prove its context free? which part didn't i understand?

homework 2 question 6

- Instructors
- Prof. Benny Chor
- Assistants
- Gal Rotem

Orit Moskovich

- Mid Term: December 12
^{th}, 2014 @ 9:00 - Exam: January 28
^{th}, 2015 - Moed B: March 13
^{th}, 2015

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