Excuse me, what do you mean by one week and two weeks?

A single week is an odd number of weeks, such as the first week, the third week, the fifth week, the seventh week and the ninth week. Biweekly is even-numbered weeks, such as the second week, the fourth week, the sixth week, the eighth week and the tenth week. Odd numbers, also known as odd numbers, are numbers in integers that are not divisible by 2. Odd numbers are 1, 3, 5, 7 and 9. It can be expressed by 2k+ 1, where k is an integer. Among integers, numbers that are not divisible by 2 are called odd numbers. An even number is a number in an integer that is divisible by 2.

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