Hello AA! Check out the highlighted green elements in my big sheet. >>6483
Even when d declines by 1 as we move left into -e, the difference between a and b remains fixed at 24.
(-1,1) a=60 b=84
(-3,1) a=59 b=83
(-5,1) a=58 b=82
wash, rinse, repeat until we arrive at the correct d value of d=12