a-a a-b a-c aaa aab aac aae aah aao aas aax ab- aba abb abc abe abh abo abs abx ac- aca acb acc ace ach aco acs acx aea aeb aec aee aeh aeo aes aex aha ahb ahc ahe ahh aho ahs ahx aoa aob aoc aoe aoh aoo aos aox as- asa asb asc ase ash aso ass asx ax- axa axe axh axo axs axx baa bab bac bae bah bao bas bax bba bbb bbc bbe bbh bbo bbs bbx bca bcb bcc bce bch bco bcs bcx be- bea beb bec bee beh beo bes bex bha bhb bhc bhe bhh bho bhs bhx boa bob boc boe boh boo bos box bsa bsb bsc bse bsh bso bss bsx bxb bxo bxx c-- caa cab cac cae cah cao cas cax cba cbb cbc cbe cbh cbo cbs cbx cca ccb ccc cce cch cco ccs ccx ce- cea ceb cec cee ceh ceo ces cex ch- cha chb chc che chh cho chs chx co- coa cob coc coe coh coo cos cox csa csb csc cse csh cso css csx cxc cxh cxo cxs cxx eaa eab eac eae eah eao eas eax eba ebb ebc ebe ebh ebo ebs ebx ec- eca ecb ecc ece ech eco ecs ecx eea eeb eec eee eeo ees eex eha ehb ehc ehe ehh eho ehs eo- eoa eob eoc eoe eoh eoo eos es- esa esb esc ese esh eso ess esx ex- exa exc exe exh exo exs exx haa hab hac hae hah hao has hax hba hbb hbc hbe hbh hbo hbs hbx hca hcb hcc hce hch hco hcs he- hea heb hec hee heh heo hes hex hha hhb hhc hhe hhh hho hhs hoa hob hoc hoe hoh hoo hos hox hsa hsb hsc hse hsh hss hsx hxc oaa oab oac oae oah oao oas oax ob- oba obb obc obe obh obo obs obx oc- oca ocb occ och oco ocs ocx oea oeb oec oee oeh oeo oes oex oha ohc ohe ohh oho ohs oo- ooa oob ooc ooh ooo oos oox os- osa osb osc ose osh oso oss osx ox- oxa oxb oxc oxo oxx saa sab sac sae sah sao sas sax sba sbb sbc sbe sbh sbo sbs sbx sca scb scc sce sch sco scs scx se- sea seb sec see seh seo ses sex sh- sha shb shc she shh sho shs soa sob soc soe soh soo sos sox ss- ssa ssb ssc sse ssh sso sss ssx sxc sxs xaa xac xas xbc xbe xbx xcb xch xcx xee xes xex xoa xoc xoo xos xox xsa xsb xsc xss xxo xxx