Table 1. IUPAC code is adapted from [100].

Symbol	Meaning	Description Origin
G	G	Guanine
A	A	Adenine
T	T	Thymine
C	C	Cytosine
R	G or A	puRine
Y	T or C	pYrimidine
M	A or C	aMino
K	G or T	Ketone
S	G or C	Strong interaction
W	A or T	Weak interaction
H	A or C or T	H follows G in alphabet
B	G or T or C	B follows A in alphabet
V	G or C or A	V follows U in alphabet
D	G or A or T	D follows C in alphabet
N	G or A or T or C	aNy