-er a-a a-b a-c aaa aab aac aae aah aak aar aau ab- aba abb abc abe abh abk abr abu ac- aca acb acc ace ach ack acr acu aea aeb aec aee aeh aek aer aeu aha ahb ahc ahe ahh ahk ahr ahu aka akb akc ake akh akk akr aku ar- ara arb arc are arh ark arr aru au- aua aub auc aue auh auk aur b-u baa bab bac bae bah bak bar bau bba bbb bbc bbe bbh bbk bbr bbu bca bcb bcc bce bch bck bcr bcu be- bea beb bec bee beh bek ber beu bha bhb bhc bhe bhh bhk bhr bhu bka bkb bkc bke bkk bkr bra brb bre brh brk brr bru bua bub buc bue buh buk bur buu c-- caa cab cac cae cah cak car cau cba cbb cbc cbe cbh cbk cbr cbu cca ccb ccc cce cch cck ccr ccu ce- cea ceb cec cee ceh cek cer ceu ch- cha chb chc che chh chk chr chu cka ckb ckc ckh cra crb crc cre crh crk crr cru cua cub cuc cue cuh cuk cur cuu eaa eab eac eae eah eak ear eau eba ebb ebc ebe ebh ebk ebr ebu ec- eca ecb ecc ece ech eck ecr ecu eea eeb eec eee eek eer eha ehb ehc ehe ehh ehr ehu eka ekb ekc eke ekh ekr eku era erb erc ere erh erk err eru eu- eua eub euc eue eur haa hab hac hae hah hak har hau hba hbb hbc hbe hbh hbk hbr hbu hca hcb hcc hce hch hck hcr he- hea heb hec hee heh hek her heu hha hhb hhc hhe hhh hhk hhr hhu hka hkb hkh hkk hkr hku hr- hra hrb hrc hre hrh hrk hrr hru hua hub huc hue huh huk hur huu ka- kaa kab kac kae kah kak kar kau kba kbb kbc kbe kbh kbk kbr kbu kca kcb kcc kce kch kck kcr kcu ke- kea keb kec kee keh kek ker kha khe khh khk khr khu kkb kkc kke kkh kkk kkr kku kra krc krk krr kru kub kuc kue kuh kuk kur kuu ra- raa rab rac rae rah rak rar rau rba rbb rbc rbe rbh rbk rbr rbu rca rcb rcc rce rch rcr rcu re- rea reb rec ree reh rek rer reu rh- rha rhb rhc rhe rhh rhr rhu rkb rkc rke rkk rku rra rrb rrc rrh rrk rrr rru rua rub ruc rue ruh ruk rur ruu ua- uaa uab uac uae uah uak uar uau uba ubb ubc ube ubh ubk ubr ubu uca ucb ucc uce uch uck ucr ucu uea ueb uec uee ueh uer uha uhb uhc uhe uhh uhr uhu uka ukb ukc uke ukk ukr uku ur- ura urb urc ure urk urr uru uua uuc uue uur uuu