a-a a-b aaa aab aad aae aao aap ab- aba abb abd abe abo abp ad- ada adb add ade ado adp aea aeb aed aee aeo aep aoa aob aod aoe aoo aop ap- apa apb apd ape apo app b-p baa bab bad bae bao bap bba bbb bbd bbe bbo bbp bda bdb bdd bde bdo bdp be- bea beb bed bee beo bep boa bob bod boe boo bop bpa bpb bpd bpe bpo bpp daa dab dad dae dao dap dba dbb dbd dbe dbo dbp dda ddb ddd dde ddo ddp de- dea deb ded dee deo dep doa dob dod doe doo dop dpa dpb dpd dpe dpo dpp eaa eab ead eae eao eap eba ebb ebd ebe ebo ebp ed- eda edb edd ede edo edp eea eeb eed eee eeo eep eo- eoa eob eod eoe eoo eop ep- epa epb epd epe epo epp oaa oab oad oae oao oap ob- oba obb obd obe obo obp oda odb odd ode odo odp oea oeb oed oee oeo oep oo- ooa oob ood ooo oop op- opa opb opd ope opo opp p-p paa pab pad pae pao pap pba pbb pbd pbe pbo pbp pda pdb pdd pde pdo pdp pea peb ped pee peo pep poa pob pod poe poo pop ppa ppb ppd ppe ppo ppp