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Given a day number (1-7), return the day of the week ("Sunday", "Monday", etc.). If an invalid day number is provided, return "Invalid".
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X322: dayOfWeek
Given a day number (1-7), return the day of the week ("Sunday", "Monday", etc.). If an invalid day number is provided, return "Invalid".
Examples:
dayOfWeek(1) -> "Sunday"
dayOfWeek(4) -> "Wednesday"
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