Determine if a given year is a leap year. Return true if it is, false otherwise.

Examples:

Input: year = 2020 Output: true Explanation: 2020 is divisible by 4 and not divisible by 100, or it is divisible by 400 Input: year = 1900 Output: false Explanation: 1900 is divisible by 100 but not by 400, so it's not a leap year
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