-er a-a a-c aaa aac aae aah aao aap aar aas aax ac- aca acc ace ach aco acp acr acs acx aea aec aee aeh aeo aep aer aes aex aha ahc ahe ahh aho ahp ahr ahs ahx aoa aoc aoe aoh aoo aop aor aos aox ap- apa apc ape aph apo app apr aps apx ar- ara arc are arh aro arp arr ars arx as- asa asc ase ash aso asp asr ass asx ax- axa axe axh axo axp axr axs axx c-- caa cac cae cah cao cap car cas cax cca ccc cce cch cco ccp ccr ccs ccx ce- cea cec cee ceh ceo cep cer ces cex ch- cha chc che chh cho chp chr chs chx co- coa coc coe coh coo cop cor cos cox cpa cpc cpe cph cpo cpp cpr cps cpx cra crc cre crh cro crp crr crs crx csa csc cse csh cso csp csr css csx cxc cxh cxo cxp cxr cxs cxx eaa eac eae eah eao eap ear eas eax ec- eca ecc ece ech eco ecr ecs ecx eea eec eee eeo eep eer ees eex eha ehc ehe ehh eho ehp ehr ehs eo- eoa eoc eoe eoh eoo eop eor eos ep- epa epc epe eph epo epp epr eps epx era erc ere erh ero erp err ers es- esa esc ese esh eso esp esr ess esx ex- exa exc exe exh exo exp exr exs exx haa hac hae hah hao hap har has hax hca hcc hce hch hco hcp hcr hcs he- hea hec hee heh heo hep her hes hex hha hhc hhe hhh hho hhp hhr hhs hoa hoc hoe hoh hoo hop hor hos hox hpa hpc hpe hph hpo hpp hpr hps hr- hra hrc hre hrh hro hrp hrr hrs hsa hsc hse hsh hsp hsr hss hsx hxc oaa oac oae oah oao oap oar oas oax oc- oca occ och oco ocp ocr ocs ocx oea oec oee oeh oeo oep oer oes oex oha ohc ohe ohh oho ohp ohr ohs oo- ooa ooc ooh ooo oop oor oos oox op- opa opc ope oph opo opp opr ops opx or- ora orc ore orh oro orp orr ors orx os- osa osc ose osh oso osp osr oss osx ox- oxa oxc oxo oxx p-p paa pac pae pah pao pap par pas pax pca pcc pce pch pco pcp pcr pcs pcx pea pec pee peh peo pep per pes pex pha phc phe pho php phr phs phx poa poc poe poh poo pop por pos pox ppa ppc ppe pph ppo ppp ppr pps ppx pra prc pre prh pro prp prr prs prx ps- psa psc pse psh pso psp psr pss psx pxc pxe pxr pxs ra- raa rac rae rah rao rap rar ras rax rca rcc rce rch rco rcp rcr rcs rcx re- rea rec ree reh reo rep rer res rex rh- rha rhc rhe rhh rho rhp rhr rhs roa roc roe roh roo rop ror ros rox rpa rpc rpe rph rpo rpp rpr rps rpx rra rrc rrh rrp rrr rrs rsa rsc rse rsh rso rsp rsr rss rsx rxp rxr rxs saa sac sae sah sao sap sar sas sax sca scc sce sch sco scp scr scs scx se- sea sec see seh seo sep ser ses sex sh- sha shc she shh sho shp shr shs soa soc soe soh soo sop sor sos sox spa spc spe sph spo spp spr sps spx sr- sra src sre srh sro srp srr srs srx ss- ssa ssc sse ssh sso ssp ssr sss ssx sxc sxs xaa xac xap xar xas xch xcp xcr xcx xee xep xer xes xex xhp xoa xoc xoo xop xor xos xox xpa xpc xpe xpo xpp xps xrc xrx xsa xsc xsp xss xxo xxp xxx