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The definition of all IUPAC characters and the list of all possible two-partitions for each IUPAC character
| IUPAC code | Set | Two-partitions |
|---|---|---|
| S | {C,G} | (C,G) |
| W | {A,T} | (A,T) |
| R | {A,G} | (A,G) |
| Y | {C,T} | (C,T) |
| K | {G,T} | (G,T) |
| M | {A,C} | (A,C) |
| B | {C,G,T} | (C,G), (G,Y), (T,S) |
| D | {A,G,T} | (A,K), (G,W), (T,R) |
| H | {A,C,T} | (A,Y), (C,W), (T,M) |
| V | {A,C,G} | (A,S), (C,R), (G,M) |
| N | {A,C,G,T} | (A,B), (C,D), (G,H), (T,V), (R,Y), (S,W), (K,M) |
