Prove $π(x+y)- π(x) \ll \frac y{\log (\log (y))}$ using Legendre sieve such that $10 ≤ y ≤ x$

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How to prove $$π(x+y)- π(x) \ll \frac y{\log (\log (y))}$$ using Legendre sieve such that $10 ≤ y ≤ x$?