Table 2. Ten most abundant residue pairs in the inverted index.

Residue Pair Descriptor	# Structures	# Occurrences
AL-4-5-4	110,080	903,128
GL-19-19-2	103,954	555,431
AL-10-11-5	103,570	643,736
EL-4-5-4	103,470	623,808
EL-5-7-6	103,351	582,756
AE-4-5-4	103,191	639,248
EL-10-11-5	102,304	544,341
GL-18-18-2	101,624	510,194
GL-19-19-3	101,494	520,548
AL-19-19-2	101,308	612,042

Sorted by number of structures containing this residue pairs. Only amino acid pairs were considered.