If $$a_1, a_2, a_3$$ and $$a_4$$ in the increasing order of the elements in the set $$\left\{\frac{2}{7}, \frac{7}{15}, \frac{5}{8}, \frac{9}{23}\right\}$$ then $$a_4 - a_1 = $$
$$\frac{2}{7}$$
$$\frac{19}{56}$$
$$\frac{17}{56}$$
$$\frac{15}{56}$$
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