SSP calculation to Look up between a range of dates with linked periods

i have had another go, I could do with a second opinion to whether it's right or not. It now looks if the next working day after the end date of the previous sick line is equal to the start day of that sickness line and includes it in the cumulative sick duration if it is.

The only thing I can think of that is not right is, this rule ignores the greater than 3 day rule if it is a linked period, regardless of the fact that the greater than 3 day rule applies to the total of the linked period.