-er a-a a-b a-c aaa aab aac aae aaf aam aar aau ab- aba abb abc abe abf abm abr abu ac- aca acb acc ace acf acm acr acu aea aeb aec aee aef aem aer aeu af- afa afb afc afe aff afm afr afu ama amb amc ame amf amm amr amu ar- ara arb arc are arf arm arr aru au- aua aub auc aue auf aum aur b-u baa bab bac bae baf bam bar bau bba bbb bbc bbe bbf bbm bbr bbu bca bcb bcc bce bcf bcm bcr bcu be- bea beb bec bee bef bem ber beu bfa bfb bfc bfe bff bfm bfr bfu bma bmb bmc bme bmf bmm bmr bmu bra brb bre brf brm brr bru bua bub buc bue buf bum bur buu c-- caa cab cac cae caf cam car cau cba cbb cbc cbe cbf cbm cbr cbu cca ccb ccc cce ccf ccm ccr ccu ce- cea ceb cec cee cef cem cer ceu cfa cfb cfc cfe cff cfm cfr cfu cma cmb cmc cme cmf cmm cmr cmu cra crb crc cre crf crm crr cru cua cub cuc cue cuf cum cur cuu eaa eab eac eae eaf eam ear eau eba ebb ebc ebe ebf ebm ebr ebu ec- eca ecb ecc ece ecf ecm ecr ecu eea eeb eec eee eef eem eer ef- efa efb efc efe eff efm efr em- ema emb emc eme emf emm emr emu era erb erc ere erf erm err eru eu- eua eub euc eue euf eur faa fab fac fae faf fam far fau fba fbb fbc fbe fbf fbm fbr fbu fca fcb fcc fce fcf fcm fcr fcu fea feb fec fee fef fem fer feu ffa ffc ffe fff ffm ffr ffu fma fmb fmc fme fmf fmm fmr fmu fra frb frc fre frf frm frr fru fua fub fue fuf fum fur fuu m-f m-r maa mab mac mae maf mam mar mau mba mbb mbc mbe mbf mbm mbr mbu mc- mca mcb mcc mce mcf mcm mcr mcu mea meb mec mee mef mem mer meu mfa mfb mfc mfe mff mfm mfr mfu mma mmb mmc mme mmf mmm mmr mmu mra mrb mrc mre mrf mrm mrr mru mua mub muc mue muf mum mur muu ra- raa rab rac rae raf ram rar rau rba rbb rbc rbe rbf rbm rbr rbu rca rcb rcc rce rcf rcm rcr rcu re- rea reb rec ree ref rem rer reu rfa rfb rfc rfe rff rfm rfr rfu rma rmb rmc rme rmf rmm rmr rra rrb rrc rrf rrm rrr rru rua rub ruc rue ruf rum rur ruu ua- uaa uab uac uae uaf uam uar uau uba ubb ubc ube ubf ubr ubu uca ucb ucc uce ucf ucm ucr ucu uea ueb uec uee uef uem uer ufa ufc ufe uff ufm ufr ufu um- uma umb umc ume umf umm umr umu ur- ura urb urc ure urf urm urr uru uua uuc uue uum uur uuu