-er a-a a-c a-t aaa aac aae aan aao aap aar aat ac- aca acc ace acn aco acp acr act aea aec aee aen aeo aep aer aet an- ana anc ane ann ano anp anr ant aoa aoc aoe aon aoo aop aor aot ap- apa apc ape apn apo app apr apt ar- ara arc are arn aro arp arr art at- ata atc ate atn ato atp atr att c-- caa cac cae can cao cap car cat cca ccc cce ccn cco ccp ccr cct ce- cea cec cee cen ceo cep cer cet cn- cna cnc cne cnn cno cnp cnr cnt co- coa coc coe con coo cop cor cot cpa cpc cpe cpn cpo cpp cpr cpt cra crc cre crn cro crp crr crt cta ctc cte ctn cto ctp ctr ctt eaa eac eae ean eao eap ear eat ec- eca ecc ece ecn eco ecr ect eea eec eee een eeo eep eer eet en- ena enc ene enn eno enp enr ent eo- eoa eoc eoe eon eoo eop eor eot ep- epa epc epe epn epo epp epr ept era erc ere ern ero erp err ert eta etc ete etn eto etp etr ett naa nac nae nan nao nap nar nat nca ncc nce ncn nco ncp ncr nct ne- nea nec nee nen neo nep ner net nna nnc nne nnn nno nnp nnt no- noa noc noe non noo nop nor not npa npc npe npn npo npp npr npt nra nrc nre nrn nro nrp nrr nrt nta ntc nte ntn nto ntp ntr ntt oaa oac oae oan oao oap oar oat oc- oca occ ocn oco ocp ocr oct oea oec oee oen oeo oep oer oet on- ona onc one onn ono onp onr ont oo- ooa ooc oon ooo oop oor oot op- opa opc ope opn opo opp opr opt or- ora orc ore orn oro orp orr ort ot- ota otc ote otn oto otp otr ott p-p paa pac pae pan pao pap par pat pca pcc pce pcn pco pcp pcr pct pea pec pee pen peo pep per pet pn- pna pnc pne pnn pno pnp pnr pnt poa poc poe pon poo pop por pot ppa ppc ppe ppn ppo ppp ppr ppt pra prc pre prn pro prp prr prt pt- pta ptc pte ptn pto ptp ptr ptt ra- raa rac rae ran rao rap rar rat rca rcc rce rcn rco rcp rcr rct re- rea rec ree ren reo rep rer ret rna rnc rnn rno rnp rnr rnt roa roc roe ron roo rop ror rot rpa rpc rpe rpn rpo rpp rpr rpt rra rrc rrn rrp rrr rrt rta rtc rte rtn rto rtp rtr rtt taa tac tae tan tao tap tar tat tca tcc tce tcn tco tcp tcr tct te- tea tec tee ten teo tep ter tet tna tnc tne tnn tno tnp tnr tnt to- toa toc toe ton too top tor tot tpa tpc tpe tpn tpo tpp tpr tpt tra trc tre trn tro trp trr trt tta ttc tte ttn tto ttp ttr ttt