-ic a-a a-b a-c a-i aaa aab aac aaf aai aak aan aar aau ab- aba abb abc abf abi abk abn abr abu ac- aca acb acc acf aci ack acn acr acu af- afa afb afc aff afi afk afn afr afu ai- aia aib aic aif aii aik ain air aiu aka akb akc aki akk akn akr aku an- ana anb anc anf ani ank ann anr anu ar- ara arb arc arf ari ark arn arr aru au- aua aub auc auf aui auk aun aur b-u baa bab bac baf bai bak ban bar bau bba bbb bbc bbf bbi bbk bbn bbr bbu bca bcb bcc bcf bci bck bcn bcr bcu bfa bfb bfc bff bfi bfn bfr bfu bi- bia bib bic bif bii bik bin bir biu bka bkb bkc bkf bkk bkn bkr bna bnb bnc bnf bni bnk bnn bnr bnu bra brb brf bri brk brn brr bru bua bub buc buf bui buk bun bur buu c-- caa cab cac caf cai cak can car cau cba cbb cbc cbf cbi cbk cbn cbr cbu cca ccb ccc ccf cci cck ccn ccr ccu cfa cfb cfc cff cfi cfk cfn cfr cfu ci- cia cib cic cif cii cik cin cir ciu cka ckb ckc cki cn- cna cnb cnc cnf cni cnn cnr cnu cra crb crc crf cri crk crn crr cru cua cub cuc cuf cui cuk cun cur cuu faa fab fac faf fai fak fan far fau fba fbb fbc fbf fbi fbk fbn fbr fbu fca fcb fcc fcf fci fck fcn fcr fcu ffa ffc fff ffi ffk ffn ffr ffu fia fib fic fif fii fik fin fir fiu fka fkb fkc fkf fki fkk fna fnb fnc fnf fni fnk fnn fnr fnu fra frb frc frf fri frk frn frr fru fua fub fuf fui fuk fun fur fuu i-f ia- iaa iab iac iaf iai ian iar iau iba ibb ibc ibf ibi ibk ibn ibr ibu ica icb icc icf ici ick icn icr icu ifa ifb ifc iff ifi ifn ifr ifu iia iib iic iif iii iin iir iiu ika ikb ikc ikf iki ikk ikr iku in- ina inb inc inf ini ink inn inr inu ir- ira irb irc irf iri irk irn irr iru iu- iua iub iuc iui iur ka- kaa kab kac kaf kai kak kan kar kau kba kbb kbc kbf kbi kbk kbn kbr kbu kca kcb kcc kci kck kcn kcr kcu kfa kfc kff kfi kfu kia kib kic kif kii kik kin kir kiu kkb kkc kki kkk kkn kkr kku kn- kna knc knf kni knk knn knr knu kra krc krf kri krk krn krr kru kub kuc kui kuk kun kur kuu n-i naa nab nac naf nai nak nan nar nau nba nbb nbc nbf nbi nbk nbn nbr nbu nca ncb ncc ncf nci nck ncn ncr ncu nfa nfb nfc nff nfi nfk nfn nfr nfu nia nib nic nif nii nik nin nir niu nka nkc nkf nki nkk nkn nkr nku nna nnb nnc nnf nni nnk nnn nnu nra nrb nrc nrf nri nrk nrn nrr nru nua nub nuc nui nuk nun nur nuu ra- raa rab rac raf rai rak ran rar rau rba rbb rbc rbf rbi rbk rbn rbr rbu rca rcb rcc rcf rci rcn rcr rcu rfa rfb rfc rff rfi rfk rfn rfr rfu ria rib ric rif rii rik rin rir rkb rkc rkf rkk rku rna rnb rnc rni rnn rnr rnu rra rrb rrc rrf rri rrk rrn rrr rru rua rub ruc ruf rui ruk run rur ruu ua- uaa uab uac uaf uai uak uan uar uau uba ubb ubc ubf ubi ubk ubn ubr ubu uca ucb ucc ucf uci uck ucn ucr ucu ufa ufc uff ufi ufn ufr ufu uia uib uic uif uii uin uir uiu uka ukb ukc ukf uki ukk ukn ukr uku un- una unb unc unf uni unk unn unr unu ur- ura urb urc urf uri urk urn urr uru uua uuc uun uur uuu