Rule new

[rchange]

I do not quite understand you. I need a mask or rule where I can find an algorithm masks:
?2? 1? 1? 1? 1? 1? 1? 1
where ?1 is ?d and ?l
where ?2 is ?u

?2?1?2?1?1?1?1?1
where ?1 is ?d and ?l
where ?2 is ?u

and many more methods