NOTE: Any reduction computed under this section only applies to the DIB benefit while it
is payable. To compute the reduced DIB benefit, you can use Interactive Comp #11.
If the DIB ends before FRA the original RIB rate (plus any COLAs that occurred) will
be payable. If the DIB ends because of attainment of FRA the RIB payable will be the
original RIB benefit (plus COLAs) and an ARF to remove months of simultaneous DIB