a-a a-b a-c aaa aab aac aae aah aao aap aas aax ab- aba abb abc abe abh abo abp abs abx ac- aca acb acc ace ach aco acp acs acx aea aeb aec aee aeh aeo aep aes aex aha ahb ahc ahe ahh aho ahp ahs ahx aoa aob aoc aoe aoh aoo aop aos aox ap- apa apb apc ape aph apo app aps apx as- asa asb asc ase ash aso asp ass asx ax- axa axe axh axo axp axs axx b-p baa bab bac bae bah bao bap bas bax bba bbb bbc bbe bbh bbo bbp bbs bbx bca bcb bcc bce bch bco bcp bcs bcx be- bea beb bec bee beh beo bep bes bex bha bhb bhc bhe bhh bho bhp bhs bhx boa bob boc boe boh boo bop bos box bpa bpb bpc bpe bph bpo bpp bps bpx bsa bsb bsc bse bsh bso bsp bss bsx bxb bxo bxx c-- caa cab cac cae cah cao cap cas cax cba cbb cbc cbe cbh cbo cbp cbs cbx cca ccb ccc cce cch cco ccp ccs ccx ce- cea ceb cec cee ceh ceo cep ces cex ch- cha chb chc che chh cho chp chs chx co- coa cob coc coe coh coo cop cos cox cpa cpb cpc cpe cph cpo cpp cps cpx csa csb csc cse csh cso csp css csx cxc cxh cxo cxp cxs cxx eaa eab eac eae eah eao eap eas eax eba ebb ebc ebe ebh ebo ebp ebs ebx ec- eca ecb ecc ece ech eco ecs ecx eea eeb eec eee eeo eep ees eex eha ehb ehc ehe ehh eho ehp ehs eo- eoa eob eoc eoe eoh eoo eop eos ep- epa epb epc epe eph epo epp eps epx es- esa esb esc ese esh eso esp ess esx ex- exa exc exe exh exo exp exs exx haa hab hac hae hah hao hap has hax hba hbb hbc hbe hbh hbo hbp hbs hbx hca hcb hcc hce hch hco hcp hcs he- hea heb hec hee heh heo hep hes hex hha hhb hhc hhe hhh hho hhp hhs hoa hob hoc hoe hoh hoo hop hos hox hpa hpb hpc hpe hph hpo hpp hps hsa hsb hsc hse hsh hsp hss hsx hxc oaa oab oac oae oah oao oap oas oax ob- oba obb obc obe obh obo obp obs obx oc- oca ocb occ och oco ocp ocs ocx oea oeb oec oee oeh oeo oep oes oex oha ohc ohe ohh oho ohp ohs oo- ooa oob ooc ooh ooo oop oos oox op- opa opb opc ope oph opo opp ops opx os- osa osb osc ose osh oso osp oss osx ox- oxa oxb oxc oxo oxx p-p paa pab pac pae pah pao pap pas pax pba pbb pbc pbe pbo pbp pbs pbx pca pcb pcc pce pch pco pcp pcs pcx pea peb pec pee peh peo pep pes pex pha phb phc phe pho php phs phx poa pob poc poe poh poo pop pos pox ppa ppb ppc ppe pph ppo ppp pps ppx ps- psa psb psc pse psh pso psp pss psx pxc pxe pxs saa sab sac sae sah sao sap sas sax sba sbb sbc sbe sbh sbo sbp sbs sbx sca scb scc sce sch sco scp scs scx se- sea seb sec see seh seo sep ses sex sh- sha shb shc she shh sho shp shs soa sob soc soe soh soo sop sos sox spa spb spc spe sph spo spp sps spx ss- ssa ssb ssc sse ssh sso ssp sss ssx sxc sxs xaa xac xap xas xbc xbe xbx xcb xch xcp xcx xee xep xes xex xhp xoa xoc xoo xop xos xox xpa xpb xpc xpe xpo xpp xps xsa xsb xsc xsp xss xxo xxp xxx