If below indicated sum can be expressed in the form of \(\large \frac{a}{b^{a}}\), where \(a\) and \(b\) are primes, then find \(a\,+\,b\)
\[ \frac{2}{3}\,-\,\frac{5}{6}\,+\,\frac{2}{3}\,-\,\frac{11}{24}\,+\, \cdot \cdot \cdot \]

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