# INMO - 2012

Let $$p_1<p_2<p_3<p_4$$ & $$q_1<q_2<q_3<q_4$$ be two sets of prime numbers such that $$p_4-p_1=8$$ & $$q_4-q_1=8$$.

Suppose $$p_1>5$$ & $$q_1>5$$, then $$p_1-q_1$$ is divisible by

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