a-a a-b a-c aaa aab aac aak aam aan aar aau ab- aba abb abc abk abm abn abr abu ac- aca acb acc ack acm acn acr acu aka akb akc akk akm akn akr aku ama amb amc amk amm amn amr amu an- ana anb anc ank anm ann anr anu ar- ara arb arc ark arm arn arr aru au- aua aub auc auk aum aun aur b-u baa bab bac bak bam ban bar bau bba bbb bbc bbk bbm bbn bbr bbu bca bcb bcc bck bcm bcn bcr bcu bka bkb bkc bkk bkm bkn bkr bma bmb bmc bmk bmm bmn bmr bmu bna bnb bnc bnk bnn bnr bnu bra brb brk brm brn brr bru bua bub buc buk bum bun bur buu c-- caa cab cac cak cam can car cau cba cbb cbc cbk cbm cbn cbr cbu cca ccb ccc cck ccm ccn ccr ccu cka ckb ckc ckm cma cmb cmc cmk cmm cmn cmr cmu cn- cna cnb cnc cnm cnn cnr cnu cra crb crc crk crm crn crr cru cua cub cuc cuk cum cun cur cuu ka- kaa kab kac kak kam kan kar kau kba kbb kbc kbk kbm kbn kbr kbu kca kcb kcc kck kcm kcn kcr kcu kkb kkc kkk kkm kkn kkr kku kma kmb kmc kmk kmm kmu kn- kna knc knk knm knn knr knu kra krc krk krn krr kru kub kuc kuk kum kun kur kuu m-r maa mab mac mak mam man mar mau mba mbb mbc mbk mbm mbr mbu mc- mca mcb mcc mck mcm mcn mcr mcu mka mkb mkc mkk mkm mkn mkr mku mma mmb mmc mmk mmm mmn mmr mmu mna mnb mnc mnk mnm mnn mnr mnu mra mrb mrc mrk mrm mrn mrr mru mua mub muc muk mum mun mur muu naa nab nac nak nam nan nar nau nba nbb nbc nbk nbm nbn nbr nbu nca ncb ncc nck ncm ncn ncr ncu nka nkc nkk nkm nkn nkr nku nma nmb nmc nmk nmm nmn nmr nmu nna nnb nnc nnk nnm nnn nnu nra nrb nrc nrk nrm nrn nrr nru nua nub nuc nuk num nun nur nuu ra- raa rab rac rak ram ran rar rau rba rbb rbc rbk rbm rbn rbr rbu rca rcb rcc rcm rcn rcr rcu rkb rkc rkk rkm rku rma rmb rmc rmm rmn rmr rna rnb rnc rnm rnn rnr rnu rra rrb rrc rrk rrm rrn rrr rru rua rub ruc ruk rum run rur ruu ua- uaa uab uac uak uam uan uar uau uba ubb ubc ubk ubn ubr ubu uca ucb ucc uck ucm ucn ucr ucu uka ukb ukc ukk ukn ukr uku um- uma umb umc umm umn umr umu un- una unb unc unk unm unn unr unu ur- ura urb urc urk urm urn urr uru uua uuc uum uun uur uuu