a-a a-b aaa aab aad aae aao aap aas ab- aba abb abd abe abo abp abs ad- ada adb add ade ado adp ads aea aeb aed aee aeo aep aes aoa aob aod aoe aoo aop aos ap- apa apb apd ape apo app aps as- asa asb asd ase aso asp ass b-p baa bab bad bae bao bap bas bba bbb bbd bbe bbo bbp bbs bda bdb bdd bde bdo bdp bds be- bea beb bed bee beo bep bes boa bob bod boe boo bop bos bpa bpb bpd bpe bpo bpp bps bsa bsb bsd bse bso bsp bss daa dab dad dae dao dap das dba dbb dbd dbe dbo dbp dbs dda ddb ddd dde ddo ddp dds de- dea deb ded dee deo dep des doa dob dod doe doo dop dos dpa dpb dpd dpe dpo dpp dps dsa dsb dsd dse dso dsp dss eaa eab ead eae eao eap eas eba ebb ebd ebe ebo ebp ebs ed- eda edb edd ede edo edp eds eea eeb eed eee eeo eep ees eo- eoa eob eod eoe eoo eop eos ep- epa epb epd epe epo epp eps es- esa esb esd ese eso esp ess oaa oab oad oae oao oap oas ob- oba obb obd obe obo obp obs oda odb odd ode odo odp ods oea oeb oed oee oeo oep oes oo- ooa oob ood ooo oop oos op- opa opb opd ope opo opp ops os- osa osb osd ose oso osp oss p-p paa pab pad pae pao pap pas pba pbb pbd pbe pbo pbp pbs pda pdb pdd pde pdo pdp pds pea peb ped pee peo pep pes poa pob pod poe poo pop pos ppa ppb ppd ppe ppo ppp pps ps- psa psb psd pse pso psp pss saa sab sad sae sao sap sas sba sbb sbd sbe sbo sbp sbs sda sdb sdd sde sdo sdp sds se- sea seb sed see seo sep ses soa sob sod soe soo sop sos spa spb spd spe spo spp sps ss- ssa ssb ssd sse sso ssp sss