-er a-a a-b a-c aaa aab aac aae aaf aah aar aau ab- aba abb abc abe abf abh abr abu ac- aca acb acc ace acf ach acr acu aea aeb aec aee aef aeh aer aeu af- afa afb afc afe aff afh afr afu aha ahb ahc ahe ahf ahh ahr ahu ar- ara arb arc are arf arh arr aru au- aua aub auc aue auf auh aur b-u baa bab bac bae baf bah bar bau bba bbb bbc bbe bbf bbh bbr bbu bca bcb bcc bce bcf bch bcr bcu be- bea beb bec bee bef beh ber beu bfa bfb bfc bfe bff bfh bfr bfu bha bhb bhc bhe bhf bhh bhr bhu bra brb bre brf brh brr bru bua bub buc bue buf buh bur buu c-- caa cab cac cae caf cah car cau cba cbb cbc cbe cbf cbh cbr cbu cca ccb ccc cce ccf cch ccr ccu ce- cea ceb cec cee cef ceh cer ceu cfa cfb cfc cfe cff cfh cfr cfu ch- cha chb chc che chf chh chr chu cra crb crc cre crf crh crr cru cua cub cuc cue cuf cuh cur cuu eaa eab eac eae eaf eah ear eau eba ebb ebc ebe ebf ebh ebr ebu ec- eca ecb ecc ece ecf ech ecr ecu eea eeb eec eee eef eer ef- efa efb efc efe eff efh efr eha ehb ehc ehe ehf ehh ehr ehu era erb erc ere erf erh err eru eu- eua eub euc eue euf eur faa fab fac fae faf fah far fau fba fbb fbc fbe fbf fbh fbr fbu fca fcb fcc fce fcf fcr fcu fea feb fec fee fef feh fer feu ffa ffc ffe fff ffh ffr ffu fha fhb fhc fhe fhf fhh fhr fra frb frc fre frf frh frr fru fua fub fue fuf fur fuu haa hab hac hae haf hah har hau hba hbb hbc hbe hbf hbh hbr hbu hca hcb hcc hce hcf hch hcr he- hea heb hec hee hef heh her heu hfa hfb hfc hfe hff hfh hfr hfu hha hhb hhc hhe hhf hhh hhr hhu hr- hra hrb hrc hre hrf hrh hrr hru hua hub huc hue huf huh hur huu ra- raa rab rac rae raf rah rar rau rba rbb rbc rbe rbf rbh rbr rbu rca rcb rcc rce rcf rch rcr rcu re- rea reb rec ree ref reh rer reu rfa rfb rfc rfe rff rfh rfr rfu rh- rha rhb rhc rhe rhf rhh rhr rhu rra rrb rrc rrf rrh rrr rru rua rub ruc rue ruf ruh rur ruu ua- uaa uab uac uae uaf uah uar uau uba ubb ubc ube ubf ubh ubr ubu uca ucb ucc uce ucf uch ucr ucu uea ueb uec uee uef ueh uer ufa ufc ufe uff ufh ufr ufu uha uhb uhc uhe uhf uhh uhr uhu ur- ura urb urc ure urf urr uru uua uuc uue uur uuu