When initial DIB entitlement is 7/80 or later, the number of dropout years used to
compute DIB is determined under the 1-for-5 rule.
If there was ever DIB entitlement prior to 7/80 the 1-for-5 rule will not apply -
regardless of whether an exclusion or non-exclusion computation is used.
In RIB freeze cases where the prior DIB entitlement was 7/80 or later and 1-for-5
drop-out applied to the DIB for any part of the 12 months preceding the attainment
of age 62, the 1-for-5 rule is used for the RIB freeze computation as well. The RIB
non-freeze computation will use the full 5-year drop out.
In survivor computations, the full 5-year dropout applies, including situations where
the deceased NH was entitled to DIB based on the 1-for-5 rule.