Doubt in afl coding

I have doubt in afl coding

Buy = ExRem( Buy, Sell );
Sell = ExRem( Sell, Buy );
Short = Sell;
Cover = Buy;

in above code what is the meaning of Exrem
and what is the meaning of the above code

please help

This function removes excessive signals:
returns 1 on the first occurence of “true” signal in Array1
then returns 0 until Array2 is true even if there are “true” signals in Array1

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