a-a a-b a-c aaa aab aac aad aae aak aan aao aau ab- aba abb abc abd abe abk abn abo abu ac- aca acb acc acd ace ack acn aco acu ad- ada adb adc add ade adk adn ado adu aea aeb aec aed aee aek aen aeo aeu aka akb akc akd ake akk akn ako aku an- ana anb anc and ane ank ann ano anu aoa aob aoc aod aoe aok aon aoo aou au- aua aub auc aud aue auk aun auo b-u baa bab bac bad bae bak ban bao bau bba bbb bbc bbd bbe bbk bbn bbo bbu bca bcb bcc bcd bce bck bcn bco bcu bda bdb bdc bdd bde bdk bdo bdu be- bea beb bec bed bee bek ben beo beu bka bkb bkc bke bkk bkn bko bna bnb bnc bnd bne bnk bnn bno bnu boa bob boc bod boe bok bon boo bou bua bub buc bud bue buk bun buo buu c-- caa cab cac cad cae cak can cao cau cba cbb cbc cbd cbe cbk cbn cbo cbu cca ccb ccc ccd cce cck ccn cco ccu cda cdb cdc cdd cde cdk cdn cdo cdu ce- cea ceb cec ced cee cek cen ceo ceu cka ckb ckc ckd cko cn- cna cnb cnc cnd cne cnn cno cnu co- coa cob coc cod coe cok con coo cou cua cub cuc cud cue cuk cun cuo cuu daa dab dac dad dae dak dan dao dau dba dbb dbc dbd dbe dbk dbn dbo dbu dca dcb dcc dcd dce dck dcn dco dcu dda ddb ddc ddd dde ddk ddn ddo ddu de- dea deb dec ded dee dek den deo deu dka dkb dkc dke dkk dko dku dna dnb dnc dnd dne dnk dnn dno doa dob doc dod doe dok don doo dou dua dub duc dud due duk dun duo eaa eab eac ead eae eak ean eao eau eba ebb ebc ebd ebe ebk ebn ebo ebu ec- eca ecb ecc ecd ece eck ecn eco ecu ed- eda edb edc edd ede edk edn edo edu eea eeb eec eed eee eek een eeo eka ekb ekc ekd eke eko eku en- ena enb enc end ene enk enn eno enu eo- eoa eob eoc eod eoe eok eon eoo eou eu- eua eub euc eud eue eun ka- kaa kab kac kad kae kak kan kao kau kba kbb kbc kbd kbe kbk kbn kbo kbu kca kcb kcc kcd kce kck kcn kcu kda kdb kdc kde kdk kdo kdu ke- kea keb kec ked kee kek ken keo kkb kkc kke kkk kkn kku kn- kna knc knd kne knk knn kno knu koa kob koc kod koe kok kon koo kou kub kuc kud kue kuk kun kuu naa nab nac nad nae nak nan nao nau nba nbb nbc nbd nbe nbk nbn nbo nbu nca ncb ncc ncd nce nck ncn nco ncu nda ndb ndc ndd nde ndk ndn ndo ndu ne- nea neb nec ned nee nek nen neo neu nka nkc nke nkk nkn nko nku nna nnb nnc nne nnk nnn nno nnu no- noa nob noc nod noe nok non noo nou nua nub nuc nud nue nuk nun nuo nuu oaa oab oac oad oae oak oan oao oau ob- oba obb obc obd obe obk obn obo obu oc- oca ocb occ ocd ock ocn oco ocu oda odb odc odd ode odn odo odu oea oeb oec oed oee oen oeo oka okb okc okd oke okk oko oku on- ona onb onc ond one onk onn ono onu oo- ooa oob ooc ood ook oon ooo ou- oua ouc oud oue ouk oun ouo ua- uaa uab uac uad uae uak uan uao uau uba ubb ubc ube ubk ubn ubo ubu uca ucb ucc ucd uce uck ucn uco ucu uda udb udc udd ude udk udn udo udu uea ueb uec ued uee uen uka ukb ukc uke ukk ukn uku un- una unb unc und une unk unn uno unu uoa uob uoc uod uoe uok uon uoo uua uuc uue uun uuu