a-a a-b a-c a-t aaa aab aac aas aat aaw aay ab- aba abb abc abs abt abw aby ac- aca acb acc acs act acw acy as- asa asb asc ass ast asw asy at- ata atb atc ats att atw aw- awa awb awc aws awt aww awy ay- aya ayc ays ayt ayw baa bab bac bas bat baw bay bba bbb bbc bbs bbt bbw bby bca bcb bcc bcs bct bcy bsa bsb bsc bss bst bsw bsy bta btb btc bts btt btw bty bwa bwb bwc bws bwy by- bya byc bys byt c-- caa cab cac cas cat caw cay cba cbb cbc cbs cbt cbw cby cca ccb ccc ccs cct ccw csa csb csc css cst csw csy cta ctb ctc cts ctt ctw cty cw- cwa cwb cwc cws cwt cya cyb cyc cys cyt cyw saa sab sac sas sat saw say sba sbb sbc sbs sbt sbw sby sca scb scc scs sct scw ss- ssa ssb ssc sss sst ssw sta stb stc sts stt stw sty swa swb swc sws swt swy sy- sya syb syc sys syt taa tab tac tas tat taw tay tba tbb tbc tbs tbt tca tcb tcc tcs tct tcw tsa tsb tsc tss tst tsw tsy tta ttb ttc tts ttt ttw tty twa twb twc tws twt tww twy tya tyc tys tyt waa wab wac was wat waw way wba wbb wbc wbs wbt wbw wca wcb wcc wcs wct wcw wsa wsb wsc wss wst wsw wta wtb wtc wts wtt wtw wwa wwc wwt www wy- wya wyc wys wyt yaa yab yac yas yat yaw yay ybc ybs yby yca ycc ycs ycw ycy ysa ysb ysc yss yst ysy yta ytc yts ytt ywc yyb yyc yys yyt yyy