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

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

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