Explanation:
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My favorite is Abraham Lincoln. He is an important president as he has freed the slaves and abolished slavery forever with his emancipation proclamation. He also brought our country through the civil war which ended with a great union win.
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It is something that drives conflict I believe
"Of" is a preposition in the phrase "Of studying" and "until" is another, as well as "to" in the phrase "to college" so there are 3 in that sentence.