-er a-a a-c a-t aaa aac aae aan aao aar aat ac- aca acc ace acn aco acr act aea aec aee aen aeo aer aet an- ana anc ane ann ano anr ant aoa aoc aoe aon aoo aor aot ar- ara arc are arn aro arr art at- ata atc ate atn ato atr att c-- caa cac cae can cao car cat cca ccc cce ccn cco ccr cct ce- cea cec cee cen ceo cer cet cn- cna cnc cne cnn cno cnr cnt co- coa coc coe con coo cor cot cra crc cre crn cro crr crt cta ctc cte ctn cto ctr ctt eaa eac eae ean eao ear eat ec- eca ecc ece ecn eco ecr ect eea eec eee een eeo eer eet en- ena enc ene enn eno enr ent eo- eoa eoc eoe eon eoo eor eot era erc ere ern ero err ert eta etc ete etn eto etr ett naa nac nae nan nao nar nat nca ncc nce ncn nco ncr nct ne- nea nec nee nen neo ner net nna nnc nne nnn nno nnt no- noa noc noe non noo nor not nra nrc nre nrn nro nrr nrt nta ntc nte ntn nto ntr ntt oaa oac oae oan oao oar oat oc- oca occ ocn oco ocr oct oea oec oee oen oeo oer oet on- ona onc one onn ono onr ont oo- ooa ooc oon ooo oor oot or- ora orc ore orn oro orr ort ot- ota otc ote otn oto otr ott ra- raa rac rae ran rao rar rat rca rcc rce rcn rco rcr rct re- rea rec ree ren reo rer ret rna rnc rnn rno rnr rnt roa roc roe ron roo ror rot rra rrc rrn rrr rrt rta rtc rte rtn rto rtr rtt taa tac tae tan tao tar tat tca tcc tce tcn tco tcr tct te- tea tec tee ten teo ter tet tna tnc tne tnn tno tnr tnt to- toa toc toe ton too tor tot tra trc tre trn tro trr trt tta ttc tte ttn tto ttr ttt