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All string that starts and ends with a different symbol: a) b(a+b)*b b)a(a+b)*b c)a(a+b)*b+b(a+b)*b d)b(a+b)*a
All string that starts and ends with a different symbol:
a) b(a+b)*b
b)a(a+b)*b
c)a(a+b)*b+b(a+b)*b
d)b(a+b)*a
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