To make it simple, we can ignore the letter S, say main task id can be 4 or 8 digits, e.g. 1234 or 12345678. We only need to identify if the main id followed by R001 or R002 always 4 digits to indicate that the task has been re-done. e.g. 12345678R001 (same as previous 1234S001) meaning this is re-do task of 12345678. If a worker works on both main and re-do task, this only counts as 1 task done; if a worker only works on main or only works on re-do task (consider as independent task), this counts as 1 task done. e.g. if a worker works on 12345678 and 12345678R001, this counts as 1 task done; if a worker works only on 12345678, this counts as 1 task done; if a worker works only on 12345678R001 (without working on 12345678), this also counts as 1 task done. Hope this is clear to you.
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