-al -ol a-a a-b a-c aaa aab aac aaf aal aao aar aau ab- aba abb abc abf abl abo abr abu ac- aca acb acc acf acl aco acr acu af- afa afb afc aff afl afo afr afu al- ala alb alc alf all alo alr alu aoa aob aoc aof aol aoo aor aou ar- ara arb arc arf arl aro arr aru au- aua aub auc auf aul auo aur b-u baa bab bac baf bal bao bar bau bba bbb bbc bbf bbl bbo bbr bbu bca bcb bcc bcf bcl bco bcr bcu bfa bfb bfc bff bfl bfo bfr bfu bla blb blc blf bll blo blr blu boa bob boc bof bol boo bor bou bra brb brf brl bro brr bru bua bub buc buf bul buo bur buu c-- caa cab cac caf cal cao car cau cba cbb cbc cbf cbl cbo cbr cbu cca ccb ccc ccf ccl cco ccr ccu cfa cfb cfc cff cfl cfo cfr cfu cl- cla clb clc clf cll clo clr clu co- coa cob coc cof col coo cor cou cra crb crc crf crl cro crr cru cua cub cuc cuf cul cuo cur cuu faa fab fac faf fal fao far fau fba fbb fbc fbf fbl fbo fbr fbu fca fcb fcc fcf fcl fco fcr fcu ffa ffc fff ffl ffo ffr ffu fla flb flc flf fll flo flr flu foa fob foc fof fol foo for fou fra frb frc frf frl fro frr fru fua fub fuf ful fuo fur fuu la- laa lab lac laf lal lao lar lau lba lbb lbc lbf lbl lbo lbr lbu lca lcb lcc lcf lcl lco lcr lcu lfa lfb lfc lff lfl lfo lfr lfu lla llb llc llf lll llo llr llu loa lob loc lof lol loo lor lou lra lrb lrc lrf lro lrr lru lua lub luc luf lul luo lur luu oaa oab oac oaf oal oao oar oau ob- oba obb obc obf obl obo obr obu oc- oca ocb occ ocf ocl oco ocr ocu of- ofa ofb ofc off ofl ofo ofr ofu ola olb olc olf oll olo olu oo- ooa oob ooc oof ool ooo oor or- ora orb orc orf orl oro orr oru ou- oua ouc ouf oul ouo our ra- raa rab rac raf ral rao rar rau rba rbb rbc rbf rbl rbo rbr rbu rca rcb rcc rcf rcl rco rcr rcu rfa rfb rfc rff rfl rfo rfr rfu rla rlc rlf rll rlo rlr rlu roa rob roc rof rol roo ror rou rra rrb rrc rrf rrl rrr rru rua rub ruc ruf ruo rur ruu ua- uaa uab uac uaf ual uao uar uau uba ubb ubc ubf ubl ubo ubr ubu uca ucb ucc ucf ucl uco ucr ucu ufa ufc uff ufl ufo ufr ufu ula ulb ulc ulf ull ulo ulr ulu uoa uob uoc uol uoo uor ur- ura urb urc urf url uro urr uru uua uuc uur uuu

a-fu aaaa aaab aaac aaaf aaal aaar aaba aabb aabc aabl aaca aacb aacc aacf aacl aaco aacr aacu aafa aafb aafc aaff aafl aala aalc aall aalo aalu aaoo aara aarc aaro aaru abaa abab abac abaf abal abar abau abb- abba abbb abbo abbr abca abcb abcc abcf abcl abcr abff abla ablo aboa abob abof abol aboo abor abou abra abrc abro abua abuf abul acaa acab acac acar acba acbl acca accc accf acco accu acfc acfl acla aclc aclr aclu acoa acol acor acou acr- acra acrc acro acrr acu- acuf acul acuo acur afaa afao afar afca afcb afcc afcu affa affc affo afla aflc afoa afol afoo afor afr- afra afrc afro afru afua alaa alac alal alao alar alau alb- alba albc albo albu alca alcc alco alfa all- alla alll allo allr allu aloa aloc alof alol aloo alor alou alro alua aluf alur aoba aoca aola aora aorb aouf aoul arab arac araf aral arar arau arba arc- arca arco arfa arfb arfc arff arfu arla arlo aroa arob aroo aror arr- arra arrc arro arrr arru arua arub arul auaa auca aufc aul- aula aulf aull aulo aulu auol aur- aura auro baaa baaf baal baar baba babb babo babr babu bac- baca bacc baco bafc baff bafo bala balc balf ball balo balu baol bar- bara barb barc barf baro barr baru bau- bauf baul baur bbau bbbb bbfc bblb bbrc bcaa bcar bcbc bcca bccc bccl bcfc bcof bcor bcra bcru bcuc bfca bffl blaa blab blac blau blcu blfc blob bloc bloo blou blrc blub bluf blur boab boac boal boar boba bobb bobo bobu boca boco bocu bofa boff bofu bola boll bolo bolu boob booc boof bool boor bor- bora borf boro borr boru boua bouf boul bour brab brac braf brao brau brca brcb brfc brfu broa brob broc brol broo bror brou brrr bruc bual buar buba bubb bubo bubu buca bucc buco bucu bufc buff bufo bufr bula bulb bull bulu buol bur- bura burb burl buro burr buru c-bo caaa caab caac caaf caal caba cabf cabo cabu cac- caca cacc caco cacr cafa cafb cafc caff cafl cafu cala calc calf call calo calu caol caor cara carb carc carf carl caro carr cauc cauf caul cauo cbac cbal cbar cbbc cbca cbcc cbcl cbcr cbcu cbfb cbfc cblb cblc cbol cbrl ccaa ccab ccac ccaf ccar ccba ccbc ccca cccb cccc cccf cccl cccu ccfa ccfc ccff ccfl ccla cclc ccob ccoc ccra ccrc ccrf ccrl ccuc cfaa cfab cfac cfao cfar cfbc cfbr cfca cfcb cfcf cfcl cfco cffb cffr cfoa cfor cfra cfrb clab claf clar clau clob clof cloo clor clou clra clro club coal coba cobb cobo cobu coca coco cocu cofc coff col- cola colb coll colo colu coob coof cool cor- cora corb corc