-ic a-a a-b a-c a-i aaa aab aac aae aah aai aas aax ab- aba abb abc abe abh abi abs abx ac- aca acb acc ace ach aci acs acx aea aeb aec aee aeh aei aes aex aha ahb ahc ahe ahh ahi ahs ahx ai- aia aib aic aie aih aii ais aix as- asa asb asc ase ash asi ass asx ax- axa axe axh axi axs axx baa bab bac bae bah bai bas bax bba bbb bbc bbe bbh bbi bbs bbx bca bcb bcc bce bch bci bcs bcx be- bea beb bec bee beh bei bes bex bha bhb bhc bhe bhh bhi bhs bhx bi- bia bib bic bie bih bii bis bix bsa bsb bsc bse bsh bsi bss bsx bxb bxi bxx c-- caa cab cac cae cah cai cas cax cba cbb cbc cbe cbh cbi cbs cbx cca ccb ccc cce cch cci ccs ccx ce- cea ceb cec cee ceh cei ces cex ch- cha chb chc che chh chi chs chx ci- cia cib cic cie cih cii cis cix csa csb csc cse csh csi css csx cxc cxh cxi cxs cxx eaa eab eac eae eah eai eas eax eba ebb ebc ebe ebh ebi ebs ebx ec- eca ecb ecc ece ech eci ecs ecx eea eeb eec eee ees eex eha ehb ehc ehe ehh ehi ehs eia eib eic eie eii eis eix es- esa esb esc ese esh esi ess esx ex- exa exc exe exh exi exs exx h-i haa hab hac hae hah hai has hax hba hbb hbc hbe hbh hbi hbs hbx hca hcb hcc hce hch hci hcs he- hea heb hec hee heh hei hes hex hha hhb hhc hhe hhh hhi hhs hia hib hic hie hih hii his hix hsa hsb hsc hse hsh hsi hss hsx hxc ia- iaa iab iac iae iah iai ias iba ibb ibc ibe ibh ibi ibs ibx ica icb icc ice ich ici ics ie- iea iec iee iei ies iex iha ihb ihc ihe ihh ihi ihs iia iib iic iie iih iii iis iix is- isa isb isc ise ish isi iss ixc ixe ixi saa sab sac sae sah sai sas sax sba sbb sbc sbe sbh sbi sbs sbx sca scb scc sce sch sci scs scx se- sea seb sec see seh sei ses sex sh- sha shb shc she shh shi shs sia sib sic sie sih sii sis six ss- ssa ssb ssc sse ssh ssi sss ssx sxc sxi sxs xaa xac xas xbc xbe xbx xcb xch xci xcx xee xes xex xia xic xie xii xis xix xsa xsb xsc xsi xss xxi xxx