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unable to FullSimplify


I get the following unexpected and inconsistent results:

FullSimplify[Expand[b + (a + b)^4]]

b + (a + b)^4


FullSimplify[Expand[a + (a + b)^4]]

a + a^4 + 4*a^3*b + 6*a^2*b^2 + 4*a*b^3 + b^4

Why they are different and why there is no simplification in the second
case?

--
Vladimir


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