I am working with survey dataset. It has 30 people (variable name = dlp, numeric) who start work in different date (variable name= date, data type=date). I would like to create a new variable "work" which reflects the fact that each of the worker complete the work in every 3 days ( represented by Round 1), then continue the same work for next three days (represented by Round 2). And after every 6 days, they take 1 day off. Before they continue with Round 3 work. And this trend is likely to continue till december 2022.