For example:
For Sat 1, 24 is the backup to 9, with 24 having at least two engines between them and 9
For Sat 2, 97 is the backup to 72, same deal
For Sat 3, 330 backs up 284, they're fairly close but not sure whether they'd have first and second due boxes together
For Sat 4, 291 backs up 324...