'How I can interprit a particular codes in Excel

I have the following Excel functions and I want to interpret them.

Assuming I have 4 columns and two rows. Rows are continuous data. For the first row for example:

IFERROR((MROUND((AVERAGE(IF((A2:(INDIRECT("RC[-1]",0))<>"")*(MOD(COLUMN(A2:(INDIRECT("RC[-1]",0))),2)=0),A2:(INDIRECT("RC[-1]",0))))),5)),"")


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