Hi, if I have a DNAStringSet object, say 5 sequences, and I want to do a sliding window across those sequences and calculate `consensusMatrix` on only a some sites of the entire sequence, what is the best way to go about this? I think that for the selection of the sites I can use a mask, and I think I can also use a row mask to mask which sequences are not included, but how about the sliding windows? Do I have to use Ranges? and if so I or G ranges? Or do I have to use Views? I want to code a trial solution to this but I'm unsure which approach is the correct one to start with.