a-a a-b a-c aaa aab aac aam aar aax aay ab- aba abb abc abm abr abx aby ac- aca acb acc acm acr acx acy ama amb amc amm amr amx amy ar- ara arb arc arm arr arx ary ax- axa axm axr axx ay- aya ayc ayr ayx baa bab bac bam bar bax bay bba bbb bbc bbm bbr bbx bby bca bcb bcc bcm bcr bcx bcy bma bmb bmc bmm bmr bmx bra brb brm brr brx bry bxb bxm bxx by- bya byc bym byr c-- caa cab cac cam car cax cay cba cbb cbc cbm cbr cbx cby cca ccb ccc ccm ccr ccx cma cmb cmc cmm cmr cmx cmy cra crb crc crm crr crx cry cxc cxr cxx cya cyb cyc cym cyr m-r maa mab mac mam mar max may mba mbb mbc mbm mbr mbx mc- mca mcb mcc mcm mcr mcx mma mmb mmc mmm mmr mmx mra mrb mrc mrm mrr mrx mry mxa mxc mxr my- mya myb myc mym myr myx ra- raa rab rac ram rar rax ray rba rbb rbc rbm rbr rbx rca rcb rcc rcm rcr rcx rma rmb rmc rmm rmr rmx rra rrb rrc rrm rrr rxr ry- rya ryc rym ryr ryy xaa xac xam xar xbc xbr xbx xcb xcr xcx xma xmc xmm xmr xmx xrc xrx xry xxx xxy xyr xyy yaa yab yac yam yar yax yay ybc ybm ybr yby yca ycc ycy yma ymc ymm yra yrc yxa yxy yyb yyc yyy