How to manage data same this?

If I wanna manage data follow Fig.1, in end of line is data 1 zigzag with data 2 and end part is a data 1. In my method logic is slowly.

How to manage data easy more than my method?

I am not sure if I understand u correctly but you can use repeat node as picture below.

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Oh thank you. When after repeated already, If I wanna increased “0” in [8] to [20], how to solve it??

@apikeairt you can do this

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