What it says on the tin. Create a scenario in which the Ottoman Empire somehow joins the Entente before World War I. Make it as plausible as possible.
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Difficult. The French wanted Syria, the Russians wanted Constantinople and the British wanted Mesopotamia (some duffers in the India Office hoped to make Iraq a province of the Raj!). Furthermore, by 1914 the Ottomans were heavily drawn to the German sphere with the Berlin to Baghdad Railway.
Best bet would probably for the Ottomans to stay neutral.