a-a a-b aaa aab aad aae aao aap aas aax ab- aba abb abd abe abo abp abs abx ad- ada adb add ade ado adp ads adx aea aeb aed aee aeo aep aes aex aoa aob aod aoe aoo aop aos aox ap- apa apb apd ape apo app aps apx as- asa asb asd ase aso asp ass asx ax- axa axe axo axp axs axx b-p baa bab bad bae bao bap bas bax bba bbb bbd bbe bbo bbp bbs bbx bda bdb bdd bde bdo bdp bds bdx be- bea beb bed bee beo bep bes bex boa bob bod boe boo bop bos box bpa bpb bpd bpe bpo bpp bps bpx bsa bsb bsd bse bso bsp bss bsx bxb bxd bxo bxx daa dab dad dae dao dap das dax dba dbb dbd dbe dbo dbp dbs dbx dda ddb ddd dde ddo ddp dds ddx de- dea deb ded dee deo dep des dex doa dob dod doe doo dop dos dox dpa dpb dpd dpe dpo dpp dps dsa dsb dsd dse dso dsp dss dsx dxd dxo dxp dxs dxx eaa eab ead eae eao eap eas eax eba ebb ebd ebe ebo ebp ebs ebx ed- eda edb edd ede edo edp eds edx eea eeb eed eee eeo eep ees eex eo- eoa eob eod eoe eoo eop eos ep- epa epb epd epe epo epp eps epx es- esa esb esd ese eso esp ess esx ex- exa exd exe exo exp exs exx oaa oab oad oae oao oap oas oax ob- oba obb obd obe obo obp obs obx oda odb odd ode odo odp ods oea oeb oed oee oeo oep oes oex oo- ooa oob ood ooo oop oos oox op- opa opb opd ope opo opp ops opx os- osa osb osd ose oso osp oss osx ox- oxa oxb oxo oxx p-p paa pab pad pae pao pap pas pax pba pbb pbd pbe pbo pbp pbs pbx pda pdb pdd pde pdo pdp pds pdx pea peb ped pee peo pep pes pex poa pob pod poe poo pop pos pox ppa ppb ppd ppe ppo ppp pps ppx ps- psa psb psd pse pso psp pss psx pxe pxs saa sab sad sae sao sap sas sax sba sbb sbd sbe sbo sbp sbs sbx sda sdb sdd sde sdo sdp sds se- sea seb sed see seo sep ses sex soa sob sod soe soo sop sos sox spa spb spd spe spo spp sps spx ss- ssa ssb ssd sse sso ssp sss ssx sxs xaa xad xap xas xbe xbx xda xdb xde xds xed xee xep xes xex xoa xod xoo xop xos xox xpa xpb xpd xpe xpo xpp xps xsa xsb xsp xss xxo xxp xxx