the same convergents among 3 irrotations

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Let a, b, c be irrational numbers with a < b < c. If a and c have identical convergents $\frac{p_0}{q_0}$, $\frac{p_1}{q_1}$, . . . , up to $\frac{p_n}{q_n}$, how to prove that b also has these same convergents up to $\frac{p_1}{q_1}$.