The following code contains several nested if-else statements. Unfortunately, it was written without proper alignment and indentation. Rewrite the code and use the proper conventions of alignment and indentation.

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if score >= A_score: print('Your grade is A.') else: if score >= B_score: print('Your grade is B.') else: if score >= C_score: print('Your grade is C.') else: if score >= D_score: print('Your grade is D.') else: print('Your grade is F.')