a-a a-c a-t aaa aac aap aar aat aax aay ac- aca acc acp acr act acx acy ap- apa apc app apr apt apx apy ar- ara arc arp arr art arx ary at- ata atc atp atr att atx ax- axa axp axr axt axx ay- aya ayc ayp ayr ayt ayx c-- caa cac cap car cat cax cay cca ccc ccp ccr cct ccx cpa cpc cpp cpr cpt cpx cra crc crp crr crt crx cry cta ctc ctp ctr ctt ctx cty cxc cxp cxr cxt cxx cya cyc cyp cyr cyt p-p paa pac pap par pat pax pay pca pcc pcp pcr pct pcx ppa ppc ppp ppr ppt ppx pra prc prp prr prt prx pry pt- pta ptc ptp ptr ptt ptx pty pxc pxr pxt py- pya pyc pyr pyt pyx ra- raa rac rap rar rat rax ray rca rcc rcp rcr rct rcx rpa rpc rpp rpr rpt rpx rra rrc rrp rrr rrt rta rtc rtp rtr rtt rtx rty rxp rxr ry- rya ryc ryr ryy t-x taa tac tap tar tat tax tay tca tcc tcp tcr tct tcx tpa tpc tpp tpr tpt tpx tra trc trp trr trt trx try tta ttc ttp ttr ttt ttx tty txt tya tyc typ tyr tyt xaa xac xap xar xat xcp xcr xcx xpa xpc xpp xpt xrc xrt xrx xry xtc xtp xtr xtx xty xxp xxx xxy xyp xyr xyy yaa yac yap yar yat yax yay yca ycc ycp ycy ypa yra yrc yrp yrt yta ytc ytp ytr ytt yxa yxy yyc yyt yyy