-al -ol a-a a-b a-c aaa aab aac aak aal aao aap ab- aba abb abc abk abl abo abp ac- aca acb acc ack acl aco acp aka akb akc akk akl ako akp al- ala alb alc alk all alo alp aoa aob aoc aok aol aoo aop ap- apa apb apc apk apl apo app b-p baa bab bac bak bal bao bap bba bbb bbc bbk bbl bbo bbp bca bcb bcc bck bcl bco bcp bka bkb bkc bkk bkl bko bkp bla blb blc blk bll blo blp boa bob boc bok bol boo bop bpa bpb bpc bpl bpo bpp c-- caa cab cac cak cal cao cap cba cbb cbc cbk cbl cbo cbp cca ccb ccc cck ccl cco ccp cka ckb ckc cko cl- cla clb clc clk cll clo clp co- coa cob coc cok col coo cop cpa cpb cpc cpk cpl cpo cpp ka- kaa kab kac kak kal kao kap kba kbb kbc kbk kbl kbo kbp kca kcb kcc kck kcl kcp kkb kkc kkk kkl kkp kl- kla klb klc klo koa kob koc kok kol koo kop kpa kpc kpk kpl kpo kpp l-p la- laa lab lac lak lal lao lap lba lbb lbc lbk lbl lbo lbp lca lcb lcc lck lcl lco lcp lka lkb lkl lkp lla llb llc llk lll llo llp loa lob loc lok lol loo lop lpa lpb lpc lpk lpl lpo lpp oaa oab oac oak oal oao oap ob- oba obb obc obk obl obo obp oc- oca ocb occ ock ocl oco ocp oka okb okc okk okl oko okp ola olb olc olk oll olo olp oo- ooa oob ooc ook ool ooo oop op- opa opb opc opk opl opo opp p-p paa pab pac pak pal pao pap pba pbb pbc pbk pbl pbo pbp pca pcb pcc pck pcl pco pcp pka pkb pkc pkl pko pkp pla plb plc plk pll plo plp poa pob poc pok pol poo pop ppa ppb ppc ppk ppl ppo ppp