a-a a-c a-t aaa aac aan aao aap aar aat ac- aca acc acn aco acp acr act an- ana anc ann ano anp anr ant aoa aoc aon aoo aop aor aot ap- apa apc apn apo app apr apt ar- ara arc arn aro arp arr art at- ata atc atn ato atp atr att c-- caa cac can cao cap car cat cca ccc ccn cco ccp ccr cct cn- cna cnc cnn cno cnp cnr cnt co- coa coc con coo cop cor cot cpa cpc cpn cpo cpp cpr cpt cra crc crn cro crp crr crt cta ctc ctn cto ctp ctr ctt naa nac nan nao nap nar nat nca ncc ncn nco ncp ncr nct nna nnc nnn nno nnp nnt no- noa noc non noo nop nor not npa npc npn npo npp npr npt nra nrc nrn nro nrp nrr nrt nta ntc ntn nto ntp ntr ntt oaa oac oan oao oap oar oat oc- oca occ ocn oco ocp ocr oct on- ona onc onn ono onp onr ont oo- ooa ooc oon ooo oop oor oot op- opa opc opn opo opp opr opt or- ora orc orn oro orp orr ort ot- ota otc otn oto otp otr ott p-p paa pac pan pao pap par pat pca pcc pcn pco pcp pcr pct pn- pna pnc pnn pno pnp pnr pnt poa poc pon poo pop por pot ppa ppc ppn ppo ppp ppr ppt pra prc prn pro prp prr prt pt- pta ptc ptn pto ptp ptr ptt ra- raa rac ran rao rap rar rat rca rcc rcn rco rcp rcr rct rna rnc rnn rno rnp rnr rnt roa roc ron roo rop ror rot rpa rpc rpn rpo rpp rpr rpt rra rrc rrn rrp rrr rrt rta rtc rtn rto rtp rtr rtt taa tac tan tao tap tar tat tca tcc tcn tco tcp tcr tct tna tnc tnn tno tnp tnr tnt to- toa toc ton too top tor tot tpa tpc tpn tpo tpp tpr tpt tra trc trn tro trp trr trt tta ttc ttn tto ttp ttr ttt