a-a a-b a-t aaa aab aao aas aat aaw ab- aba abb abo abs abt abw aoa aob aoo aos aot aow as- asa asb aso ass ast asw at- ata atb ato ats att atw aw- awa awb awo aws awt aww baa bab bao bas bat baw bba bbb bbo bbs bbt bbw boa bob boo bos bot bow bsa bsb bso bss bst bsw bta btb bto bts btt btw bwa bwb bwo bws oaa oab oao oas oat oaw ob- oba obb obo obs obt obw oo- ooa oob ooo oos oot oow os- osa osb oso oss ost osw ot- ota otb oto ots ott otw owa owb owo ows owt oww saa sab sao sas sat saw sba sbb sbo sbs sbt sbw soa sob soo sos sot sow ss- ssa ssb sso sss sst ssw sta stb sto sts stt stw swa swb swo sws swt taa tab tao tas tat taw tba tbb tbo tbs tbt to- toa tob too tos tot tow tsa tsb tso tss tst tsw tta ttb tto tts ttt ttw twa twb two tws twt tww waa wab wao was wat waw wba wbb wbo wbs wbt wbw woa wob woo wos wot wow wsa wsb wso wss wst wsw wta wtb wto wts wtt wtw wwa wwo wwt www