a-a a-b a-c aaa aab aac aae aam aas aax ab- aba abb abc abe abm abs abx ac- aca acb acc ace acm acs acx aea aeb aec aee aem aes aex ama amb amc ame amm ams amx as- asa asb asc ase asm ass asx ax- axa axe axm axs axx baa bab bac bae bam bas bax bba bbb bbc bbe bbm bbs bbx bca bcb bcc bce bcm bcs bcx be- bea beb bec bee bem bes bex bma bmb bmc bme bmm bms bmx bsa bsb bsc bse bsm bss bsx bxb bxm bxx c-- caa cab cac cae cam cas cax cba cbb cbc cbe cbm cbs cbx cca ccb ccc cce ccm ccs ccx ce- cea ceb cec cee cem ces cex cma cmb cmc cme cmm cms cmx csa csb csc cse csm css csx cxc cxs cxx eaa eab eac eae eam eas eax eba ebb ebc ebe ebm ebs ebx ec- eca ecb ecc ece ecm ecs ecx eea eeb eec eee eem ees eex em- ema emb emc eme emm ems emx es- esa esb esc ese esm ess esx ex- exa exc exe exs exx maa mab mac mae mam mas max mba mbb mbc mbe mbm mbs mbx mc- mca mcb mcc mce mcm mcs mcx mea meb mec mee mem mes mex mma mmb mmc mme mmm mms mmx msa msb msc mse msm mss msx mxa mxc mxs saa sab sac sae sam sas sax sba sbb sbc sbe sbm sbs sbx sca scb scc sce scm scs scx se- sea seb sec see sem ses sex sma smb smc sme smm sms smx ss- ssa ssb ssc sse ssm sss ssx sxc sxm sxs xaa xac xam xas xbc xbe xbx xcb xcx xee xem xes xex xma xmc xmm xms xmx xsa xsb xsc xsm xss xxx