-ic a-a a-b a-c a-i aaa aab aac aad aai aak aar aau ab- aba abb abc abd abi abk abr abu ac- aca acb acc acd aci ack acr acu ad- ada adb adc add adi adk adr adu ai- aia aib aic aid aii aik air aiu aka akb akc akd aki akk akr aku ar- ara arb arc ard ari ark arr aru au- aua aub auc aud aui auk aur b-u baa bab bac bad bai bak bar bau bba bbb bbc bbd bbi bbk bbr bbu bca bcb bcc bcd bci bck bcr bcu bda bdb bdc bdd bdi bdk bdr bdu bi- bia bib bic bid bii bik bir biu bka bkb bkc bkk bkr bra brb brd bri brk brr bru bua bub buc bud bui buk bur buu c-- caa cab cac cad cai cak car cau cba cbb cbc cbd cbi cbk cbr cbu cca ccb ccc ccd cci cck ccr ccu cda cdb cdc cdd cdi cdk cdr cdu ci- cia cib cic cid cii cik cir ciu cka ckb ckc ckd cki cra crb crc crd cri crk crr cru cua cub cuc cud cui cuk cur cuu daa dab dac dad dai dak dar dau dba dbb dbc dbd dbi dbk dbr dbu dca dcb dcc dcd dci dck dcr dcu dda ddb ddc ddd ddi ddk ddr ddu di- dia dib dic did dii dik dir diu dka dkb dkc dki dkk dkr dku dra drb drc drd dri drk drr dru dua dub duc dud dui duk dur i-d ia- iaa iab iac iad iai iar iau iba ibb ibc ibd ibi ibk ibr ibu ica icb icc icd ici ick icr icu ida idb idc idd idi idk idr idu iia iib iic iid iii iir iiu ika ikb ikc iki ikk ikr iku ir- ira irb irc ird iri irk irr iru iu- iua iub iuc iud iui iur ka- kaa kab kac kad kai kak kar kau kba kbb kbc kbd kbi kbk kbr kbu kca kcb kcc kcd kci kck kcr kcu kda kdb kdc kdk kdr kdu kia kib kic kid kii kik kir kiu kkb kkc kki kkk kkr kku kra krc krd kri krk krr kru kub kuc kud kui kuk kur kuu ra- raa rab rac rad rai rak rar rau rba rbb rbc rbd rbi rbk rbr rbu rca rcb rcc rcd rci rcr rcu rda rdb rdc rdd rdi rdr rdu ria rib ric rid rii rik rir rkb rkc rkk rku rra rrb rrc rrd rri rrk rrr rru rua rub ruc rud rui ruk rur ruu ua- uaa uab uac uad uai uak uar uau uba ubb ubc ubi ubk ubr ubu uca ucb ucc ucd uci uck ucr ucu uda udb udc udd udi udk udr udu uia uib uic uid uii uir uiu uka ukb ukc uki ukk ukr uku ur- ura urb urc urd uri urk urr uru uua uuc uur uuu