-al -ol a-a a-b a-c aaa aab aac aad aaf aak aal aao aar ab- aba abb abc abd abf abk abl abo abr ac- aca acb acc acd acf ack acl aco acr ad- ada adb adc add adf adk adl ado adr af- afa afb afc afd aff afk afl afo afr aka akb akc akd akk akl ako akr al- ala alb alc ald alf alk all alo alr aoa aob aoc aod aof aok aol aoo aor ar- ara arb arc ard arf ark arl aro arr baa bab bac bad baf bak bal bao bar bba bbb bbc bbd bbf bbk bbl bbo bbr bca bcb bcc bcd bcf bck bcl bco bcr bda bdb bdc bdd bdf bdk bdl bdo bdr bfa bfb bfc bfd bff bfl bfo bfr bka bkb bkc bkf bkk bkl bko bkr bla blb blc bld blf blk bll blo blr boa bob boc bod bof bok bol boo bor bra brb brd brf brk brl bro brr c-- caa cab cac cad caf cak cal cao car cba cbb cbc cbd cbf cbk cbl cbo cbr cca ccb ccc ccd ccf cck ccl cco ccr cda cdb cdc cdd cdf cdk cdl cdo cdr cfa cfb cfc cfd cff cfk cfl cfo cfr cka ckb ckc ckd cko cl- cla clb clc cld clf clk cll clo clr co- coa cob coc cod cof cok col coo cor cra crb crc crd crf crk crl cro crr daa dab dac dad daf dak dal dao dar dba dbb dbc dbd dbf dbk dbl dbo dbr dca dcb dcc dcd dcf dck dcl dco dcr dda ddb ddc ddd ddf ddk ddl ddo ddr dfa dfb dfc dfd dff dfk dfl dfo dfr dka dkb dkc dkk dkl dko dkr dl- dla dlb dlc dld dlf dlk dll dlo dlr doa dob doc dod dof dok dol doo dor dra drb drc drd drk drl dro drr faa fab fac fad faf fak fal fao far fba fbb fbc fbd fbf fbk fbl fbo fbr fca fcb fcc fcd fcf fck fcl fco fcr fda fdb fdc fdd fdf fdk fdl fdo fdr ffa ffc ffd fff ffk ffl ffo ffr fka fkb fkc fkf fkk fkl fla flb flc fld flf fll flo flr foa fob foc fof fok fol foo for fra frb frc frd frf frk frl fro frr ka- kaa kab kac kad kaf kak kal kao kar kba kbb kbc kbd kbf kbk kbl kbo kbr kca kcb kcc kcd kck kcl kcr kda kdb kdc kdf kdk kdl kdo kdr kfa kfc kfd kff kfo kkb kkc kkk kkl kkr kl- kla klb klc kld klf klo klr koa kob koc kod kof kok kol koo kor kra krc krd krf krk krl kro krr la- laa lab lac lad laf lak lal lao lar lba lbb lbc lbd lbf lbk lbl lbo lbr lca lcb lcc lcd lcf lck lcl lco lcr lda ldb ldc ldd ldf ldk ldl ldo ldr lfa lfb lfc lfd lff lfk lfl lfo lfr lka lkb lkl lkr lla llb llc lld llf llk lll llo llr loa lob loc lod lof lok lol loo lor lra lrb lrc lrd lrf lrk lro lrr oaa oab oac oad oaf oak oal oao oar ob- oba obb obc obd obf obk obl obo obr oc- oca ocb occ ocd ocf ock ocl oco ocr oda odb odc odd odf odl odo odr of- ofa ofb ofc ofd off ofl ofo ofr oka okb okc okd okk okl oko okr ola olb olc old olf olk oll olo oo- ooa oob ooc ood oof ook ool ooo oor or- ora orb orc ord orf ork orl oro orr ra- raa rab rac rad raf rak ral rao rar rba rbb rbc rbd rbf rbk rbl rbo rbr rca rcb rcc rcd rcf rcl rco rcr rda rdb rdc rdd rdf rdl rdo rdr rfa rfb rfc rfd rff rfk rfl rfo rfr rkb rkc rkf rkk rko rla rlc rld rlf rll rlo rlr roa rob roc rod rof rok rol roo ror rra rrb rrc rrd rrf rrk rrl rrr

a-ak a-do a-ok aaaa aaab aaac aaad aaaf aaal aaar aaba aabb aabc aabd aabl aaca aacb aacc aacd aacf aack aacl aaco aacr aada aadc aafa aafb aafc aafd aaff aafl aaka aala aalc aald aall aalo aaoo aara aarc aard aaro abaa abab abac abad abaf abak abal abar abb- abba abbb abbo abbr abca abcb abcc abcd abcf abcl abcr abda abdo abff abla ablo aboa abob abod abof abok abol aboo abor abra abrc abro acaa acab acac acad acar acba acbl acca accc accd accf acco acda acdb acdc acdf acfc acfd acfl ackd acla aclc aclr acoa acod acol acor acr- acra acrc acro acrr adaa adab adac adad adak adal adao adar adba adbc adcc adda addc addd addl addo addr adfa adfc adfl adob adoc adod adok adoo ador adra adro afaa afad afak afao afar afca afcb afcc afdb afdc afdl affa affc affo afka afkr afla aflc afoa afol afoo afor afr- afra afrc afro akaa akal akao akar akca akka akko aklo akok akr- akra alaa alac alad alak alal alao alar alb- alba albc albo alca alcc alco ald- alda aldl aldo alfa alk- alka alkb alkd alko all- alla alll allo allr aloa aloc alod alof alok alol aloo alor alro aoba aoca aola aora aorb arab arac arad araf arak aral arar arba arc- arca arco arda ardc ardf ardl ardo arfa arfb arfc arff arka arko arla arlo aroa arob arod aroo aror arr- arra arrc arrk arro arrr baaa baad baaf baak baal baar baba babb babo babr bac- baca bacc back baco bada badb badd bado badr bafc baff bafo bak- baka bakl bako bakr bala balc bald balf balk ball balo baol bar- bara barb barc bard barf bark