Class 1: pAAA, pCCC, pGGG, pTTT
Class 2: pAAC, pCCA, pGGT, pTTG
Class 3: pAAG, pCCT, pGGA, pTTC
Class 4: pAAT, pCCG, pGGC, pTTA
Class 5: pACA, pCAC, pGTG, pTGT
Class 6: pACC, pCAA, pGTT, pTGG
Class 7: pACG, pCAT, pGTA, pTGC
Class 8: pACT, pCAG, pGTC, pTGA
Class 9: pAGA, pCTC, pGAG, pTCT
Class 10: pAGC, pCTA, pGAT, pTCG
Class 11: pAGG, pCTT, pGAA, pTCC
Class 12: pAGT, pCTG, pGAC, pTCA
Class 13: pATA, pCGC, pGCG, pTAT
Class 14: pATC, pCGA, pGCT, pTAG
Class 15: pATG, pCGT, pGCA, pTAC
Class 16: pATT, pCGG, pGCC, pTAA