-er a-a a-b a-c aaa aab aac aae aah aar aau ab- aba abb abc abe abh abr abu ac- aca acb acc ace ach acr acu aea aeb aec aee aeh aer aeu aha ahb ahc ahe ahh ahr ahu ar- ara arb arc are arh arr aru au- aua aub auc aue auh aur b-u baa bab bac bae bah bar bau bba bbb bbc bbe bbh bbr bbu bca bcb bcc bce bch bcr bcu be- bea beb bec bee beh ber beu bha bhb bhc bhe bhh bhr bhu bra brb bre brh brr bru bua bub buc bue buh bur buu c-- caa cab cac cae cah car cau cba cbb cbc cbe cbh cbr cbu cca ccb ccc cce cch ccr ccu ce- cea ceb cec cee ceh cer ceu ch- cha chb chc che chh chr chu cra crb crc cre crh crr cru cua cub cuc cue cuh cur cuu eaa eab eac eae eah ear eau eba ebb ebc ebe ebh ebr ebu ec- eca ecb ecc ece ech ecr ecu eea eeb eec eee eer eha ehb ehc ehe ehh ehr ehu era erb erc ere erh err eru eu- eua eub euc eue eur haa hab hac hae hah har hau hba hbb hbc hbe hbh hbr hbu hca hcb hcc hce hch hcr he- hea heb hec hee heh her heu hha hhb hhc hhe hhh hhr hhu hr- hra hrb hrc hre hrh hrr hru hua hub huc hue huh hur huu ra- raa rab rac rae rah rar rau rba rbb rbc rbe rbh rbr rbu rca rcb rcc rce rch rcr rcu re- rea reb rec ree reh rer reu rh- rha rhb rhc rhe rhh rhr rhu rra rrb rrc rrh rrr rru rua rub ruc rue ruh rur ruu ua- uaa uab uac uae uah uar uau uba ubb ubc ube ubh ubr ubu uca ucb ucc uce uch ucr ucu uea ueb uec uee ueh uer uha uhb uhc uhe uhh uhr uhu ur- ura urb urc ure urr uru uua uuc uue uur uuu