-al -ol a-a a-b a-c aaa aab aac aak aal aan aao aap ab- aba abb abc abk abl abn abo abp ac- aca acb acc ack acl acn aco acp aka akb akc akk akl akn ako akp al- ala alb alc alk all aln alo alp an- ana anb anc ank anl ann ano anp aoa aob aoc aok aol aon aoo aop ap- apa apb apc apk apl apn apo app b-p baa bab bac bak bal ban bao bap bba bbb bbc bbk bbl bbn bbo bbp bca bcb bcc bck bcl bcn bco bcp bka bkb bkc bkk bkl bkn bko bkp bla blb blc blk bll bln blo blp bna bnb bnc bnk bnl bnn bno bnp boa bob boc bok bol bon boo bop bpa bpb bpc bpl bpn bpo bpp c-- caa cab cac cak cal can cao cap cba cbb cbc cbk cbl cbn cbo cbp cca ccb ccc cck ccl ccn cco ccp cka ckb ckc cko cl- cla clb clc clk cll cln clo clp cn- cna cnb cnc cnl cnn cno cnp co- coa cob coc cok col con coo cop cpa cpb cpc cpk cpl cpn cpo cpp ka- kaa kab kac kak kal kan kao kap kba kbb kbc kbk kbl kbn kbo kbp kca kcb kcc kck kcl kcn kcp kkb kkc kkk kkl kkn kkp kl- kla klb klc klo kn- kna knc knk knl knn kno knp koa kob koc kok kol kon koo kop kpa kpc kpk kpl kpn kpo kpp l-p la- laa lab lac lak lal lan lao lap lba lbb lbc lbk lbl lbo lbp lca lcb lcc lck lcl lcn lco lcp lka lkb lkl lkp lla llb llc llk lll lln llo llp lna lnb lnc lnk lnl lnn lno lnp loa lob loc lok lol lon loo lop lpa lpb lpc lpk lpl lpn lpo lpp naa nab nac nak nal nan nao nap nba nbb nbc nbk nbl nbn nbo nbp nca ncb ncc nck ncl ncn nco ncp nka nkc nkk nkn nko nkp nla nlb nlc nlk nll nln nlo nlp nna nnb nnc nnk nnl nnn nno nnp no- noa nob noc nok nol non noo nop npa npb npc npl npn npo npp oaa oab oac oak oal oan oao oap ob- oba obb obc obk obl obn obo obp oc- oca ocb occ ock ocl ocn oco ocp oka okb okc okk okl oko okp ola olb olc olk oll oln olo olp on- ona onb onc onk onl onn ono onp oo- ooa oob ooc ook ool oon ooo oop op- opa opb opc opk opl opn opo opp p-p paa pab pac pak pal pan pao pap pba pbb pbc pbk pbl pbn pbo pbp pca pcb pcc pck pcl pcn pco pcp pka pkb pkc pkl pkn pko pkp pla plb plc plk pll pln plo plp pn- pna pnb pnc pnk pnl pnn pno pnp poa pob poc pok pol pon poo pop ppa ppb ppc ppk ppl ppn ppo ppp