Sarah is baking cookies for a bake sale. She has 4.5 kilograms of flour. She uses 1.25 kilograms of flour to make the dough for chocolate chip cookies, and 0.75 kilograms to make the dough for oatmeal cookies. How much flour does Sarah have left after making the cookie doughs? Let's think step by step and output the final answer within \boxed{}.
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