a-a a-b a-c aaa aab aac aag aam aar aau ab- aba abb abc abg abm abr abu ac- aca acb acc acg acm acr acu ag- aga agb agc agg agm agr agu ama amb amc amg amm amr amu ar- ara arb arc arg arm arr aru au- aua aub auc aug aum aur b-u baa bab bac bag bam bar bau bba bbb bbc bbg bbm bbr bbu bca bcb bcc bcg bcm bcr bcu bga bgb bgc bgg bgm bgr bgu bma bmb bmc bmg bmm bmr bmu bra brb brg brm brr bru bua bub buc bug bum bur buu c-- caa cab cac cag cam car cau cba cbb cbc cbg cbm cbr cbu cca ccb ccc ccg ccm ccr ccu cga cgb cgc cgg cgm cgr cgu cma cmb cmc cmg cmm cmr cmu cra crb crc crg crm crr cru cua cub cuc cug cum cur cuu gaa gab gac gag gam gar gau gba gbc gbg gbm gbr gbu gca gcb gcc gcg gcm gcr gcu gga ggb ggc ggg ggm ggr ggu gma gmb gmc gmg gmm gmr gra grb grc grg grm grr gru gu- gua gub guc gug gum gur guu m-r maa mab mac mag mam mar mau mba mbb mbc mbg mbm mbr mbu mc- mca mcb mcc mcg mcm mcr mcu mga mgb mgc mgm mgr mgu mma mmb mmc mmg mmm mmr mmu mra mrb mrc mrg mrm mrr mru mua mub muc mug mum mur muu ra- raa rab rac rag ram rar rau rba rbb rbc rbg rbm rbr rbu rca rcb rcc rcg rcm rcr rcu rga rgb rgc rgg rgr rma rmb rmc rmg rmm rmr rra rrb rrc rrg rrm rrr rru rua rub ruc rug rum rur ruu ua- uaa uab uac uag uam uar uau uba ubb ubc ubg ubr ubu uca ucb ucc ucg ucm ucr ucu uga ugb ugc ugg ugm ugr ugu um- uma umb umc umg umm umr umu ur- ura urb urc urg urm urr uru uua uuc uug uum uur uuu