GSS typing of backbone i/i-1 A,G,S,T based on characteristic chemical shifts
sequential assignments of A,S,T GSSs based on matching CA/CB chemical shifts
add sequence
sequential GSS assignments based on chemical shift matching of overlapping CA/CB resonances
Sparky book-keeping: delete unused resonances
pick new peak based on matching chemical shifts of resonance
sequential GSS assignments based on chemical shift matching; GSS typing based on characteristic chemical shifts