-al a-a a-b a-c aaa aab aac aad aaf aak aal aar aau ab- aba abb abc abd abf abk abl abr abu ac- aca acb acc acd acf ack acl acr acu ad- ada adb adc add adf adk adl adr adu af- afa afb afc afd aff afk afl afr afu aka akb akc akd akk akl akr aku al- ala alb alc ald alf alk all alr alu ar- ara arb arc ard arf ark arl arr aru au- aua aub auc aud auf auk aul aur b-u baa bab bac bad baf bak bal bar bau bba bbb bbc bbd bbf bbk bbl bbr bbu bca bcb bcc bcd bcf bck bcl bcr bcu bda bdb bdc bdd bdf bdk bdl bdr bdu bfa bfb bfc bfd bff bfl bfr bfu bka bkb bkc bkf bkk bkl bkr bla blb blc bld blf blk bll blr blu bra brb brd brf brk brl brr bru bua bub buc bud buf buk bul bur buu c-- caa cab cac cad caf cak cal car cau cba cbb cbc cbd cbf cbk cbl cbr cbu cca ccb ccc ccd ccf cck ccl ccr ccu cda cdb cdc cdd cdf cdk cdl cdr cdu cfa cfb cfc cfd cff cfk cfl cfr cfu cka ckb ckc ckd cl- cla clb clc cld clf clk cll clr clu cra crb crc crd crf crk crl crr cru cua cub cuc cud cuf cuk cul cur cuu daa dab dac dad daf dak dal dar dau dba dbb dbc dbd dbf dbk dbl dbr dbu dca dcb dcc dcd dcf dck dcl dcr dcu dda ddb ddc ddd ddf ddk ddl ddr ddu dfa dfb dfc dfd dff dfk dfl dfr dfu dka dkb dkc dkk dkl dkr dku dl- dla dlb dlc dld dlf dlk dll dlr dlu dra drb drc drd drk drl drr dru dua dub duc dud duf duk dul dur faa fab fac fad faf fak fal far fau fba fbb fbc fbd fbf fbk fbl fbr fbu fca fcb fcc fcd fcf fck fcl fcr fcu fda fdb fdc fdd fdf fdk fdl fdr fdu ffa ffc ffd fff ffk ffl ffr ffu fka fkb fkc fkf fkk fkl fla flb flc fld flf fll flr flu fra frb frc frd frf frk frl frr fru fua fub fud fuf fuk ful fur fuu ka- kaa kab kac kad kaf kak kal kar kau kba kbb kbc kbd kbf kbk kbl kbr kbu kca kcb kcc kcd kck kcl kcr kcu kda kdb kdc kdf kdk kdl kdr kdu kfa kfc kfd kff kfu kkb kkc kkk kkl kkr kku kl- kla klb klc kld klf klr klu kra krc krd krf krk krl krr kru kub kuc kud kuk kul kur kuu la- laa lab lac lad laf lak lal lar lau lba lbb lbc lbd lbf lbk lbl lbr lbu lca lcb lcc lcd lcf lck lcl lcr lcu lda ldb ldc ldd ldf ldk ldl ldr ldu lfa lfb lfc lfd lff lfk lfl lfr lfu lka lkb lkl lkr lla llb llc lld llf llk lll llr llu lra lrb lrc lrd lrf lrk lrr lru lua lub luc lud luf luk lul lur luu ra- raa rab rac rad raf rak ral rar rau rba rbb rbc rbd rbf rbk rbl rbr rbu rca rcb rcc rcd rcf rcl rcr rcu rda rdb rdc rdd rdf rdl rdr rdu rfa rfb rfc rfd rff rfk rfl rfr rfu rkb rkc rkf rkk rku rla rlc rld rlf rll rlr rlu rra rrb rrc rrd rrf rrk rrl rrr rru rua rub ruc rud ruf ruk rur ruu ua- uaa uab uac uad uaf uak ual uar uau uba ubb ubc ubf ubk ubl ubr ubu uca ucb ucc ucd ucf uck ucl ucr ucu uda udb udc udd udf udk udl udr udu ufa ufc ufd uff ufl ufr ufu uka ukb ukc ukf ukk ukl ukr uku ula ulb ulc uld ulf ulk ull ulr ulu ur- ura urb urc urd urf urk url urr uru uua uuc uur uuu