高手们，请帮忙翻译一句话

to save your time, i should inform you the unit you enrolled has the same content as my previous class. however, you are still welcome.

In order not to affect your time, I must point out that you registered in the course of the course content with me on the contents of the first section is the same. But it is equally welcome to join you.

In order not to waste your time, I have to point out that the content of the course which you have registered is the same with the first class I gave you. However, you are still welcome.

For not affecting your time,I have to point out that the content of the course you registed is the same as the first lesson I give you.But welcome your joining us still.

In order not to affect your time, I must point out that you registered in the course of the course content with me on the contents of the first section is the same. But it is equally welcome to join you.

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