-al a-a a-b aaa aab aal aan aap ab- aba abb abl abn abp al- ala alb all aln alp an- ana anb anl ann anp ap- apa apb apl apn app b-p baa bab bal ban bap bba bbb bbl bbn bbp bla blb bll bln blp bna bnb bnl bnn bnp bpa bpb bpl bpn bpp l-p la- laa lab lal lan lap lba lbb lbl lbp lla llb lll lln llp lna lnb lnl lnn lnp lpa lpb lpl lpn lpp naa nab nal nan nap nba nbb nbl nbn nbp nla nlb nll nln nlp nna nnb nnl nnn nnp npa npb npl npn npp p-p paa pab pal pan pap pba pbb pbl pbn pbp pla plb pll pln plp pn- pna pnb pnl pnn pnp ppa ppb ppl ppn ppp