The genesis of the original discussion around discrete, or divergent (anomalous) design, originated with the initial EAD re: pitots, AF447,
AFAIK.
Actually, before that, with BA038, and common (ICE/FUEL) failure that cost a Hull, and a compound fracture of a Femur.
EG: had 038 been powered by a GE on the starboard side, the accident would not have occurred.
That actually more precisely describes anomalous SPEC....