-er a-a a-b a-c aaa aab aac aae aah aan aar aau ab- aba abb abc abe abh abn abr abu ac- aca acb acc ace ach acn acr acu aea aeb aec aee aeh aen aer aeu aha ahb ahc ahe ahh ahn ahr ahu an- ana anb anc ane anh ann anr anu ar- ara arb arc are arh arn arr aru au- aua aub auc aue auh aun aur b-u baa bab bac bae bah ban bar bau bba bbb bbc bbe bbh bbn bbr bbu bca bcb bcc bce bch bcn bcr bcu be- bea beb bec bee beh ben ber beu bha bhb bhc bhe bhh bhr bhu bna bnb bnc bne bnn bnr bnu bra brb bre brh brn brr bru bua bub buc bue buh bun bur buu c-- caa cab cac cae cah can car cau cba cbb cbc cbe cbh cbn cbr cbu cca ccb ccc cce cch ccn ccr ccu ce- cea ceb cec cee ceh cen cer ceu ch- cha chb chc che chh chn chr chu cn- cna cnb cnc cne cnh cnn cnr cnu cra crb crc cre crh crn crr cru cua cub cuc cue cuh cun cur cuu eaa eab eac eae eah ean ear eau eba ebb ebc ebe ebh ebn ebr ebu ec- eca ecb ecc ece ech ecn ecr ecu eea eeb eec eee een eer eha ehb ehc ehe ehh ehn ehr ehu en- ena enb enc ene enh enn enr enu era erb erc ere erh ern err eru eu- eua eub euc eue eun eur haa hab hac hae hah han har hau hba hbb hbc hbe hbh hbn hbr hbu hca hcb hcc hce hch hcn hcr he- hea heb hec hee heh hen her heu hha hhb hhc hhe hhh hhn hhr hhu hna hnb hnc hne hnh hnn hnu hr- hra hrb hrc hre hrh hrn hrr hru hua hub huc hue huh hun hur huu naa nab nac nae nah nan nar nau nba nbb nbc nbe nbn nbr nbu nca ncb ncc nce nch ncn ncr ncu ne- nea neb nec nee neh nen ner neu nha nhb nhc nhe nhh nhn nhr nhu nna nnb nnc nne nnh nnn nnu nra nrb nrc nre nrn nrr nru nua nub nuc nue nuh nun nur nuu ra- raa rab rac rae rah ran rar rau rba rbb rbc rbe rbh rbn rbr rbu rca rcb rcc rce rch rcn rcr rcu re- rea reb rec ree reh ren rer reu rh- rha rhb rhc rhe rhh rhn rhr rhu rna rnb rnc rnh rnn rnr rnu rra rrb rrc rrh rrn rrr rru rua rub ruc rue ruh run rur ruu ua- uaa uab uac uae uah uan uar uau uba ubb ubc ube ubh ubn ubr ubu uca ucb ucc uce uch ucn ucr ucu uea ueb uec uee ueh uen uer uha uhb uhc uhe uhh uhr uhu un- una unb unc une unh unn unr unu ur- ura urb urc ure urn urr uru uua uuc uue uun uur uuu