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$\left ( 1 + \frac{1}{ \color{#D61F06}{4}} \right ) \left ( 1 + \frac{1}{\color{#D61F06}{5}} \right ) \left ( 1 + \frac{1}{\color{#D61F06}{6}} \right ) \left ( 1 + \frac{1}{\color{#D61F06}{7}} \right )$

Evaluate the expression above.

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