-er a-a a-c aaa aac aae aag aao aar aaw ac- aca acc ace acg aco acr acw aea aec aee aeg aeo aer aew ag- aga agc age agg ago agr agw aoa aoc aoe aog aoo aor aow ar- ara arc are arg aro arr arw aw- awa awc awe awg awo awr aww c-- caa cac cae cag cao car caw cca ccc cce ccg cco ccr ccw ce- cea cec cee ceg ceo cer cew cga cgc cge cgg cgo cgr cgw co- coa coc coe cog coo cor cow cra crc cre crg cro crr crw cw- cwa cwc cwe cwg cwo cwr eaa eac eae eag eao ear eaw ec- eca ecc ece ecg eco ecr ecw eea eec eee eeg eeo eer eew ega egc ege egg ego egr egw eo- eoa eoc eoe eog eoo eor eow era erc ere erg ero err erw ewa ewc ewe ewo ewr eww gaa gac gae gag gao gar gaw gca gcc gce gcg gco gcr gcw ge- gea gec gee geg geo ger gew gga ggc ggg ggo ggr ggw goa goc goe gog goo gor gow gra grc gre grg gro grr grw gwa gwc gwe gwg gwr oaa oac oae oag oao oar oaw oc- oca occ ocg oco ocr ocw oea oec oee oeg oeo oer oga ogc oge ogg ogo oo- ooa ooc oog ooo oor oow or- ora orc ore org oro orr owa owc owe owo oww ra- raa rac rae rag rao rar raw rca rcc rce rcg rco rcr rcw re- rea rec ree reg reo rer rew rga rgc rge rgg rgo rgr rgw roa roc roe rog roo ror row rra rrc rrg rrr rwa rwc rwe rwr waa wac wae wag wao war waw wca wcc wce wcg wco wcr wcw wea wec wee weg weo wer wew wga wgc wgo wgr wgw woa woc woe wog woo wor wow wr- wra wrc wre wrg wro wrr wrw wwa wwc wwe wwo www