missing assignment for G78; three SS that matched the CA(i-1) shift
of the following SS37 (assigned to 79R):

 - SS63 was clearly not a G b/c its G-peak was an i-1 instead of i
 - SS137 had i-1 peaks inconsistent with the i peaks of SS2 (which
   had previously been assigned to residue N77) and was therefore
   impossible
 - SS138 had a very weak CA peak in the G range, and did not have
   any obvious i-1 peaks, but was not inconsistent with the data
   of SS2/N77; it *may* have extremely tiny i-1 peaks matching
   those of SS2/N77; as it is not inconsistent, it was chosen