-er a-a a-c aaa aac aae aag aar aav ac- aca acc ace acg acr acv aea aec aee aeg aer aev ag- aga agc age agg agr agv ar- ara arc are arg arr arv av- ava avc ave avg avr c-- caa cac cae cag car cav cca ccc cce ccg ccr ccv ce- cea cec cee ceg cer cev cga cgc cge cgg cgr cgv cra crc cre crg crr crv cva cvc cve cvg cvr cvv eaa eac eae eag ear eav ec- eca ecc ece ecg ecr ecv eea eec eee eeg eer eev ega egc ege egg egr era erc ere erg err erv eva evc eve evg evr evv gaa gac gae gag gar gav gca gcc gce gcg gcr ge- gea gec gee geg ger gev gga ggc ggg ggr ggv gra grc gre grg grr grv gva gvc gve gvg gvr ra- raa rac rae rag rar rav rca rcc rce rcg rcr rcv re- rea rec ree reg rer rev rga rgc rge rgg rgr rgv rra rrc rrg rrr rva rvc rve rvg rvr rvv v-a v-e vaa vac vae vag var vav vca vcc vce vcr vea vec vee veg ver vga vgc vgg vgr vra vrc vre vrg vrr vva vvc vvg vvr vvv