Any kind of circular data that repeats itself. In the case of wheel factorisation, it is a wheel "rolling" over the number line. Any data structure will do. Ei

Any kind of circular data that repeats itself. In the case of wheel factorisation, it is a wheel "rolling" over the number line. Any data structure will do. Either a circular one or one with O(1) access time. It is the concept used in the article with a vector mask repeating every 15 elements. It is a technique. I have just always used a circular list for it :)