a-a a-b a-c aaa aab aac aah aak aan aar aau ab- aba abb abc abh abk abn abr abu ac- aca acb acc ach ack acn acr acu aha ahb ahc ahh ahk ahn ahr ahu aka akb akc akh akk akn akr aku an- ana anb anc anh ank ann anr anu ar- ara arb arc arh ark arn arr aru au- aua aub auc auh auk aun aur b-u baa bab bac bah bak ban bar bau bba bbb bbc bbh bbk bbn bbr bbu bca bcb bcc bch bck bcn bcr bcu bha bhb bhc bhh bhk bhr bhu bka bkb bkc bkk bkn bkr bna bnb bnc bnk bnn bnr bnu bra brb brh brk brn brr bru bua bub buc buh buk bun bur buu c-- caa cab cac cah cak can car cau cba cbb cbc cbh cbk cbn cbr cbu cca ccb ccc cch cck ccn ccr ccu ch- cha chb chc chh chk chn chr chu cka ckb ckc ckh cn- cna cnb cnc cnh cnn cnr cnu cra crb crc crh crk crn crr cru cua cub cuc cuh cuk cun cur cuu haa hab hac hah hak han har hau hba hbb hbc hbh hbk hbn hbr hbu hca hcb hcc hch hck hcn hcr hha hhb hhc hhh hhk hhn hhr hhu hka hkb hkh hkk hkn hkr hku hna hnb hnc hnh hnk hnn hnu hr- hra hrb hrc hrh hrk hrn hrr hru hua hub huc huh huk hun hur huu ka- kaa kab kac kah kak kan kar kau kba kbb kbc kbh kbk kbn kbr kbu kca kcb kcc kch kck kcn kcr kcu kha khh khk khn khr khu kkb kkc kkh kkk kkn kkr kku kn- kna knc knk knn knr knu kra krc krk krn krr kru kub kuc kuh kuk kun kur kuu naa nab nac nah nak nan nar nau nba nbb nbc nbk nbn nbr nbu nca ncb ncc nch nck ncn ncr ncu nha nhb nhc nhh nhk nhn nhr nhu nka nkc nkk nkn nkr nku nna nnb nnc nnh nnk nnn nnu nra nrb nrc nrk nrn nrr nru nua nub nuc nuh nuk nun nur nuu ra- raa rab rac rah rak ran rar rau rba rbb rbc rbh rbk rbn rbr rbu rca rcb rcc rch rcn rcr rcu rh- rha rhb rhc rhh rhn rhr rhu rkb rkc rkk rku rna rnb rnc rnh rnn rnr rnu rra rrb rrc rrh rrk rrn rrr rru rua rub ruc ruh ruk run rur ruu ua- uaa uab uac uah uak uan uar uau uba ubb ubc ubh ubk ubn ubr ubu uca ucb ucc uch uck ucn ucr ucu uha uhb uhc uhh uhr uhu uka ukb ukc ukk ukn ukr uku un- una unb unc unh unk unn unr unu ur- ura urb urc urk urn urr uru uua uuc uun uur uuu