I went through the manuals and can't find the meaning of the below flag:
Here is the link to manual for this flag: filt_rules_l
Can anyone explain?
Edit: The full IMPUTE2 code is irrelevant, I am not using the command to impute, I received an imputed data and the script used to impute. This one flag was a mystery to me. I will update the post with impute software version when I find out.