Last iteration I noticed BR09_04's block id names BR10_03, itself the next
exception entry, and flagged it as suggestive but untested. Tested: sorting all
282 by offset, entry[i].field equals entry[i+1]'s own id in 8 of 281 (2.8%),
indistinguishable from chance -- and BR09_04 was one of the eight.
Recorded rather than dropped because it is exactly the kind of pattern that
reads as a discovery when spotted in a sample of one.
The offset from the entry's own id is broadly spread, 7 to 14 and beyond with a
peak at 9-11, so the field is near the entry's id without standing in any fixed
relation to it.
cd83b69389