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Table 1 Di-nucleotides mapping in 22-symbol alphabet.

From: Detecting the borders between coding and non-coding DNA regions in prokaryotes based on recursive segmentation and nucleotide doublets statistics

Di-nucleotide Symbol Di-nucleotide Symbol
AA AA GA GA
AC AC GC GC
AG AG GG GG
AT AT GT GT
CA CA TA TA
CC CC TC TC
CG CG TG TG
CT CT TT TT