a-a a-b aaa aab aad aae aaf aao aap ab- aba abb abd abe abf abo abp ad- ada adb add ade adf ado adp aea aeb aed aee aef aeo aep af- afa afb afd afe aff afo afp aoa aob aod aoe aof aoo aop ap- apa apb apd ape apf apo app b-p baa bab bad bae baf bao bap bba bbb bbd bbe bbf bbo bbp bda bdb bdd bde bdf bdo bdp be- bea beb bed bee bef beo bep bfa bfb bfd bfe bff bfo bfp boa bob bod boe bof boo bop bpa bpb bpd bpe bpf bpo bpp daa dab dad dae daf dao dap dba dbb dbd dbe dbf dbo dbp dda ddb ddd dde ddf ddo ddp de- dea deb ded dee def deo dep dfa dfb dfd dfe dff dfo dfp doa dob dod doe dof doo dop dpa dpb dpd dpe dpf dpo dpp eaa eab ead eae eaf eao eap eba ebb ebd ebe ebf ebo ebp ed- eda edb edd ede edf edo edp eea eeb eed eee eef eeo eep ef- efa efb efd efe eff efo efp eo- eoa eob eod eoe eof eoo eop ep- epa epb epd epe epf epo epp faa fab fad fae faf fao fap fba fbb fbd fbe fbf fbo fbp fda fdb fdd fde fdf fdo fdp fea feb fed fee fef feo fep ffa ffd ffe fff ffo ffp foa fob foe fof foo fop fpa fpb fpd fpe fpo fpp oaa oab oad oae oaf oao oap ob- oba obb obd obe obf obo obp oda odb odd ode odf odo odp oea oeb oed oee oef oeo oep of- ofa ofb ofd ofe off ofo ofp oo- ooa oob ood oof ooo oop op- opa opb opd ope opf opo opp p-p paa pab pad pae paf pao pap pba pbb pbd pbe pbf pbo pbp pda pdb pdd pde pdf pdo pdp pea peb ped pee pef peo pep pfa pfb pfd pfe pff pfo pfp poa pob pod poe pof poo pop ppa ppb ppd ppe ppf ppo ppp