a-a a-b a-c aaa aab aac aae aaf aam aau aax ab- aba abb abc abe abf abm abu abx ac- aca acb acc ace acf acm acu acx aea aeb aec aee aef aem aeu aex af- afa afb afc afe aff afm afu afx ama amb amc ame amf amm amu amx au- aua aub auc aue auf aum aux ax- axa axe axm axx b-u baa bab bac bae baf bam bau bax bba bbb bbc bbe bbf bbm bbu bbx bca bcb bcc bce bcf bcm bcu bcx be- bea beb bec bee bef bem beu bex bfa bfb bfc bfe bff bfm bfu bfx bma bmb bmc bme bmf bmm bmu bmx bua bub buc bue buf bum buu bux bxb bxm bxx c-- caa cab cac cae caf cam cau cax cba cbb cbc cbe cbf cbm cbu cbx cca ccb ccc cce ccf ccm ccu ccx ce- cea ceb cec cee cef cem ceu cex cfa cfb cfc cfe cff cfm cfu cfx cma cmb cmc cme cmf cmm cmu cmx cua cub cuc cue cuf cum cuu cxc cxf cxx eaa eab eac eae eaf eam eau eax eba ebb ebc ebe ebf ebm ebu ebx ec- eca ecb ecc ece ecf ecm ecu ecx eea eeb eec eee eef eem eex ef- efa efb efc efe eff efm efx em- ema emb emc eme emf emm emu emx eu- eua eub euc eue euf eux ex- exa exc exe exu exx faa fab fac fae faf fam fau fax fba fbb fbc fbe fbf fbm fbu fbx fca fcb fcc fce fcf fcm fcu fcx fea feb fec fee fef fem feu fex ffa ffc ffe fff ffm ffu ffx fma fmb fmc fme fmf fmm fmu fmx fua fub fue fuf fum fuu fux fxe fxm fxu fxx m-f maa mab mac mae maf mam mau max mba mbb mbc mbe mbf mbm mbu mbx mc- mca mcb mcc mce mcf mcm mcu mcx mea meb mec mee mef mem meu mex mfa mfb mfc mfe mff mfm mfu mma mmb mmc mme mmf mmm mmu mmx mua mub muc mue muf mum muu mux mxa mxc mxu ua- uaa uab uac uae uaf uam uau uba ubb ubc ube ubf ubu ubx uca ucb ucc uce ucf ucm ucu uea ueb uec uee uef uem ufa ufc ufe uff ufm ufu ufx um- uma umb umc ume umf umm umu uua uuc uue uum uuu uxb uxc uxf uxu xaa xac xaf xam xau xbc xbe xbx xcb xcf xcx xee xem xeu xex xfa xfe xfm xfx xma xmc xmf xmm xmu xmx xue xxx