a-a a-b a-c aaa aab aac aad aam aan aao aau ab- aba abb abc abd abm abn abo abu ac- aca acb acc acd acm acn aco acu ad- ada adb adc add adm adn ado adu ama amb amc amd amm amn amo amu an- ana anb anc and anm ann ano anu aoa aob aoc aod aom aon aoo aou au- aua aub auc aud aum aun auo b-u baa bab bac bad bam ban bao bau bba bbb bbc bbd bbm bbn bbo bbu bca bcb bcc bcd bcm bcn bco bcu bda bdb bdc bdd bdm bdo bdu bma bmb bmc bmd bmm bmn bmo bmu bna bnb bnc bnd bnn bno bnu boa bob boc bod bom bon boo bou bua bub buc bud bum bun buo buu c-- caa cab cac cad cam can cao cau cba cbb cbc cbd cbm cbn cbo cbu cca ccb ccc ccd ccm ccn cco ccu cda cdb cdc cdd cdm cdn cdo cdu cma cmb cmc cmd cmm cmn cmo cmu cn- cna cnb cnc cnd cnm cnn cno cnu co- coa cob coc cod com con coo cou cua cub cuc cud cum cun cuo cuu daa dab dac dad dam dan dao dau dba dbb dbc dbd dbm dbn dbo dbu dca dcb dcc dcd dcm dcn dco dcu dda ddb ddc ddd ddm ddn ddo ddu dma dmb dmc dmd dmm dmn dmo dmu dna dnb dnc dnd dnm dnn dno doa dob doc dod dom don doo dou dua dub duc dud dum dun duo m-o maa mab mac mad mam man mao mau mba mbb mbc mbd mbm mbo mbu mc- mca mcb mcc mcd mcm mcn mco mcu mda mdb mdc mdd mdm mdn mdo mdu mma mmb mmc mmd mmm mmn mmo mmu mna mnb mnc mnm mnn mno mnu moa mob moc mod mom mon moo mou mua mub muc mud mum mun muu naa nab nac nad nam nan nao nau nba nbb nbc nbd nbm nbn nbo nbu nca ncb ncc ncd ncm ncn nco ncu nda ndb ndc ndd ndm ndn ndo ndu nma nmb nmc nmd nmm nmn nmo nmu nna nnb nnc nnm nnn nno nnu no- noa nob noc nod nom non noo nou nua nub nuc nud num nun nuo nuu oaa oab oac oad oam oan oao oau ob- oba obb obc obd obm obn obo obu oc- oca ocb occ ocd ocm ocn oco ocu oda odb odc odd odm odn odo odu om- oma omb omc omd omm omn omo omu on- ona onb onc ond onn ono onu oo- ooa oob ooc ood oom oon ooo ou- oua ouc oud oum oun ouo ua- uaa uab uac uad uam uan uao uau uba ubb ubc ubn ubo ubu uca ucb ucc ucd ucm ucn uco ucu uda udb udc udd udm udn udo udu um- uma umb umc umd umm umn umo umu un- una unb unc und unm unn uno unu uoa uob uoc uod uom uon uoo uua uuc uum uun uuu