-al -ol a-a a-b a-c aaa aab aac aak aal aao aap aar ab- aba abb abc abk abl abo abp abr ac- aca acb acc ack acl aco acp acr aka akb akc akk akl ako akp akr al- ala alb alc alk all alo alp alr aoa aob aoc aok aol aoo aop aor ap- apa apb apc apk apl apo app apr ar- ara arb arc ark arl aro arp arr b-p baa bab bac bak bal bao bap bar bba bbb bbc bbk bbl bbo bbp bbr bca bcb bcc bck bcl bco bcp bcr bka bkb bkc bkk bkl bko bkp bkr bla blb blc blk bll blo blp blr boa bob boc bok bol boo bop bor bpa bpb bpc bpl bpo bpp bpr bra brb brk brl bro brp brr c-- caa cab cac cak cal cao cap car cba cbb cbc cbk cbl cbo cbp cbr cca ccb ccc cck ccl cco ccp ccr cka ckb ckc cko cl- cla clb clc clk cll clo clp clr co- coa cob coc cok col coo cop cor cpa cpb cpc cpk cpl cpo cpp cpr cra crb crc crk crl cro crp crr ka- kaa kab kac kak kal kao kap kar kba kbb kbc kbk kbl kbo kbp kbr kca kcb kcc kck kcl kcp kcr kkb kkc kkk kkl kkp kkr kl- kla klb klc klo klr koa kob koc kok kol koo kop kor kpa kpc kpk kpl kpo kpp kpr kra krc krk krl kro krp krr l-p la- laa lab lac lak lal lao lap lar lba lbb lbc lbk lbl lbo lbp lbr lca lcb lcc lck lcl lco lcp lcr lka lkb lkl lkp lkr lla llb llc llk lll llo llp llr loa lob loc lok lol loo lop lor lpa lpb lpc lpk lpl lpo lpp lpr lra lrb lrc lrk lro lrp lrr oaa oab oac oak oal oao oap oar ob- oba obb obc obk obl obo obp obr oc- oca ocb occ ock ocl oco ocp ocr oka okb okc okk okl oko okp okr ola olb olc olk oll olo olp oo- ooa oob ooc ook ool ooo oop oor op- opa opb opc opk opl opo opp opr or- ora orb orc ork orl oro orp orr p-p paa pab pac pak pal pao pap par pba pbb pbc pbk pbl pbo pbp pbr pca pcb pcc pck pcl pco pcp pcr pka pkb pkc pkl pko pkp pkr pla plb plc plk pll plo plp plr poa pob poc pok pol poo pop por ppa ppb ppc ppk ppl ppo ppp ppr pra prb prc prk prl pro prp prr ra- raa rab rac rak ral rao rap rar rba rbb rbc rbk rbl rbo rbp rbr rca rcb rcc rcl rco rcp rcr rkb rkc rkk rko rkp rla rlc rll rlo rlp rlr roa rob roc rok rol roo rop ror rpa rpb rpc rpk rpl rpo rpp rpr rra rrb rrc rrk rrl rrp rrr