Power query let multiple let , in expressions and when needed.

Hi,

I have attached the workbook with all three examples.

I have a m code function ; code;;

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Which I decided to put the to table part in the first step;

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But this gave the error of in rtc not being recognised, so I copied it, and it works but has another layer of let in around it?
I can't seem to find much on using multiple let statements, can someone explain a bit or point me in the direction of some info?

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Richard