-al -ol a-a a-b aaa aab aal aan aao aap ab- aba abb abl abn abo abp al- ala alb all aln alo alp an- ana anb anl ann ano anp aoa aob aol aon aoo aop ap- apa apb apl apn apo app b-p baa bab bal ban bao bap bba bbb bbl bbn bbo bbp bla blb bll bln blo blp bna bnb bnl bnn bno bnp boa bob bol bon boo bop bpa bpb bpl bpn bpo bpp l-p la- laa lab lal lan lao lap lba lbb lbl lbo lbp lla llb lll lln llo llp lna lnb lnl lnn lno lnp loa lob lol lon loo lop lpa lpb lpl lpn lpo lpp naa nab nal nan nao nap nba nbb nbl nbn nbo nbp nla nlb nll nln nlo nlp nna nnb nnl nnn nno nnp no- noa nob nol non noo nop npa npb npl npn npo npp oaa oab oal oan oao oap ob- oba obb obl obn obo obp ola olb oll oln olo olp on- ona onb onl onn ono onp oo- ooa oob ool oon ooo oop op- opa opb opl opn opo opp p-p paa pab pal pan pao pap pba pbb pbl pbn pbo pbp pla plb pll pln plo plp pn- pna pnb pnl pnn pno pnp poa pob pol pon poo pop ppa ppb ppl ppn ppo ppp