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$\large { \begin{array} {c c c c c c c c c c c} 1/2 & 2/3 & 3 /4 & 4 /5 \\ 1/3& 2/4 & 3/ 5 \\ 1/4 & 2/5 \\ 1/5 \\ \end{array}}$

What is the sum of all the above fractions?

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