-al -ol a-a a-b a-c aaa aab aac aaf aaj aak aal aao ab- aba abb abc abf abj abk abl abo ac- aca acb acc acf acj ack acl aco af- afa afb afc aff afj afk afl afo aja ajb ajc ajf ajj ajk ajl ajo aka akb akc akj akk akl ako al- ala alb alc alf alj alk all alo aoa aob aoc aof aoj aok aol aoo baa bab bac baf baj bak bal bao bba bbb bbc bbf bbk bbl bbo bca bcb bcc bcf bcj bck bcl bco bfa bfb bfc bff bfj bfl bfo bja bjc bjf bjj bjk bka bkb bkc bkf bkk bkl bko bla blb blc blf blj blk bll blo boa bob boc bof boj bok bol boo c-- c-j caa cab cac caf caj cak cal cao cba cbb cbc cbf cbj cbk cbl cbo cca ccb ccc ccf ccj cck ccl cco cfa cfb cfc cff cfk cfl cfo cja cjb cjc cjf cjk cka ckb ckc cko cl- cla clb clc clf clj clk cll clo co- coa cob coc cof coj cok col coo faa fab fac faf faj fak fal fao fba fbb fbc fbf fbk fbl fbo fca fcb fcc fcf fcj fck fcl fco ffa ffc fff ffk ffl ffo fja fjb fjc fka fkb fkc fkf fkj fkk fkl fla flb flc flf fll flo foa fob foc fof fok fol foo jaa jab jac jaf jaj jak jal jao jba jbc jbf jbj jbk jbl jbo jca jcb jcc jcf jck jcl jco jfa jfb jfc jff jfj jfk jfl jfo jja jjb jjc jjf jjj jjk jjl jka jkb jkk jkl jko jla jlb jlc jlf jll jlo joa job joc jof joj jok jol joo ka- kaa kab kac kaf kaj kak kal kao kba kbb kbc kbf kbk kbl kbo kca kcb kcc kck kcl kfa kfc kff kfo kjb kjc kkb kkc kkk kkl kl- kla klb klc klf klo koa kob koc kof kok kol koo la- laa lab lac laf laj lak lal lao lba lbb lbc lbf lbj lbk lbl lbo lca lcb lcc lcf lcj lck lcl lco lfa lfb lfc lff lfk lfl lfo ljf ljj lka lkb lkl lla llb llc llf llj llk lll llo loa lob loc lof loj lok lol loo oaa oab oac oaf oaj oak oal oao ob- oba obb obc obf obj obk obl obo oc- oca ocb occ ocf ocj ock ocl oco of- ofa ofb ofc off ofl ofo oja ojb ojc ojo oka okb okc okj okk okl oko ola olb olc olf olk oll olo oo- ooa oob ooc oof ook ool ooo