-er a-a a-b a-c aaa aab aac aae aak aam aan aar aau ab- aba abb abc abe abk abm abn abr abu ac- aca acb acc ace ack acm acn acr acu aea aeb aec aee aek aem aen aer aeu aka akb akc ake akk akm akn akr aku ama amb amc ame amk amm amn amr amu an- ana anb anc ane ank anm ann anr anu ar- ara arb arc are ark arm arn arr aru au- aua aub auc aue auk aum aun aur b-u baa bab bac bae bak bam ban bar bau bba bbb bbc bbe bbk bbm bbn bbr bbu bca bcb bcc bce bck bcm bcn bcr bcu be- bea beb bec bee bek bem ben ber beu bka bkb bkc bke bkk bkm bkn bkr bma bmb bmc bme bmk bmm bmn bmr bmu bna bnb bnc bne bnk bnn bnr bnu bra brb bre brk brm brn brr bru bua bub buc bue buk bum bun bur buu c-- caa cab cac cae cak cam can car cau cba cbb cbc cbe cbk cbm cbn cbr cbu cca ccb ccc cce cck ccm ccn ccr ccu ce- cea ceb cec cee cek cem cen cer ceu cka ckb ckc ckm cma cmb cmc cme cmk cmm cmn cmr cmu cn- cna cnb cnc cne cnm cnn cnr cnu cra crb crc cre crk crm crn crr cru cua cub cuc cue cuk cum cun cur cuu eaa eab eac eae eak eam ean ear eau eba ebb ebc ebe ebk ebm ebn ebr ebu ec- eca ecb ecc ece eck ecm ecn ecr ecu eea eeb eec eee eek eem een eer eka ekb ekc eke ekr eku em- ema emb emc eme emk emm emn emr emu en- ena enb enc ene enk enm enn enr enu era erb erc ere erk erm ern err eru eu- eua eub euc eue eun eur ka- kaa kab kac kae kak kam kan kar kau kba kbb kbc kbe kbk kbm kbn kbr kbu kca kcb kcc kce kck kcm kcn kcr kcu ke- kea keb kec kee kek kem ken ker kkb kkc kke kkk kkm kkn kkr kku kma kmb kmc kme kmk kmm kmu kn- kna knc kne knk knm knn knr knu kra krc krk krn krr kru kub kuc kue kuk kum kun kur kuu m-r maa mab mac mae mak mam man mar mau mba mbb mbc mbe mbk mbm mbr mbu mc- mca mcb mcc mce mck mcm mcn mcr mcu mea meb mec mee mek mem men mer meu mka mkb mkc mke mkk mkm mkn mkr mku mma mmb mmc mme mmk mmm mmn mmr mmu mna mnb mnc mne mnk mnm mnn mnr mnu mra mrb mrc mre mrk mrm mrn mrr mru mua mub muc mue muk mum mun mur muu naa nab nac nae nak nam nan nar nau nba nbb nbc nbe nbk nbm nbn nbr nbu nca ncb ncc nce nck ncm ncn ncr ncu ne- nea neb nec nee nek nem nen ner neu nka nkc nke nkk nkm nkn nkr nku nma nmb nmc nme nmk nmm nmn nmr nmu nna nnb nnc nne nnk nnm nnn nnu nra nrb nrc nre nrk nrm nrn nrr nru nua nub nuc nue nuk num nun nur nuu ra- raa rab rac rae rak ram ran rar rau rba rbb rbc rbe rbk rbm rbn rbr rbu rca rcb rcc rce rcm rcn rcr rcu re- rea reb rec ree rek rem ren rer reu rkb rkc rke rkk rkm rku rma rmb rmc rme rmm rmn rmr rna rnb rnc rnm rnn rnr rnu rra rrb rrc rrk rrm rrn rrr rru rua rub ruc rue ruk rum run rur ruu ua- uaa uab uac uae uak uam uan uar uau uba ubb ubc ube ubk ubn ubr ubu uca ucb ucc uce uck ucm ucn ucr ucu uea ueb uec uee uem uen uer uka ukb ukc uke ukk ukn ukr uku um- uma umb umc ume umm umn umr umu un- una unb unc une unk unm unn unr unu ur- ura urb urc ure urk urm urn urr uru uua uuc uue uum uun uur uuu