a-a a-b a-c aaa aab aac aas aaw aay ab- aba abb abc abs abw aby ac- aca acb acc acs acw acy as- asa asb asc ass asw asy aw- awa awb awc aws aww awy ay- aya ayc ays ayw baa bab bac bas baw bay bba bbb bbc bbs bbw bby bca bcb bcc bcs bcy bsa bsb bsc bss bsw bsy bwa bwb bwc bws bwy by- bya byc bys c-- caa cab cac cas caw cay cba cbb cbc cbs cbw cby cca ccb ccc ccs ccw csa csb csc css csw csy cw- cwa cwb cwc cws cya cyb cyc cys cyw saa sab sac sas saw say sba sbb sbc sbs sbw sby sca scb scc scs scw ss- ssa ssb ssc sss ssw swa swb swc sws swy sy- sya syb syc sys waa wab wac was waw way wba wbb wbc wbs wbw wca wcb wcc wcs wcw wsa wsb wsc wss wsw wwa wwc www wy- wya wyc wys yaa yab yac yas yaw yay ybc ybs yby yca ycc ycs ycw ycy ysa ysb ysc yss ysy ywc yyb yyc yys yyy