Class 1: pAAA, pCCC, pGGG, pTTT
Class 2: pAAC, pACA, pACC, pCAA, pCAC, pCCA, pGGT, pGTG, pGTT, pTGG, pTGT, pTTG
Class 3: pAAG, pAGA, pAGG, pCCT, pCTC, pCTT, pGAA, pGAG, pGGA, pTCC, pTCT, pTTC
Class 4: pAAT, pATA, pATT, pCCG, pCGC, pCGG, pGCC, pGCG, pGGC, pTAA, pTAT, pTTA
Class 5: pACG, pACT, pAGC, pAGT, pATC, pATG, pCAG, pCAT, pCGA, pCGT, pCTA, pCTG, pGAC, pGAT, pGCA, pGCT, pGTA, pGTC, pTAC, pTAG, pTCA, pTCG, pTGA, pTGC