a-a a-b a-c aaa aab aac aad aak aao aas aaw ab- aba abb abc abd abk abo abs abw ac- aca acb acc acd ack aco acs acw ad- ada adb adc add adk ado ads adw aka akb akc akd akk ako aks akw aoa aob aoc aod aok aoo aos aow as- asa asb asc asd ask aso ass asw aw- awa awb awc awd awk awo aws aww baa bab bac bad bak bao bas baw bba bbb bbc bbd bbk bbo bbs bbw bca bcb bcc bcd bck bco bcs bda bdb bdc bdd bdk bdo bds bdw bka bkb bkc bkk bko bks bkw boa bob boc bod bok boo bos bow bsa bsb bsc bsd bsk bso bss bsw bwa bwb bwc bwd bwk bwo bws c-- caa cab cac cad cak cao cas caw cba cbb cbc cbd cbk cbo cbs cbw cca ccb ccc ccd cck cco ccs ccw cda cdb cdc cdd cdk cdo cds cdw cka ckb ckc ckd cko cks ckw co- coa cob coc cod cok coo cos cow csa csb csc csd csk cso css csw cw- cwa cwb cwc cwd cwk cwo cws daa dab dac dad dak dao das daw dba dbb dbc dbd dbk dbo dbs dca dcb dcc dcd dck dco dcs dcw dda ddb ddc ddd ddk ddo dds ddw dka dkb dkc dkk dko dks dkw doa dob doc dod dok doo dos dow dsa dsb dsc dsd dsk dso dss dsw dwa dwb dwc dwo dws dww ka- kaa kab kac kad kak kao kas kaw kba kbb kbc kbd kbk kbo kbs kbw kca kcb kcc kcd kck kcs kda kdb kdc kdk kdo kds kkb kkc kkk kks koa kob koc kod kok koo kos kow ksa ksb ksc ksd ksk kso kss ksw kw- kwa kwc kwd kwk kwo kws kww oaa oab oac oad oak oao oas oaw ob- oba obb obc obd obk obo obs obw oc- oca ocb occ ocd ock oco ocs ocw oda odb odc odd odo ods oka okb okc okd okk oko oks okw oo- ooa oob ooc ood ook ooo oos oow os- osa osb osc osd osk oso oss osw owa owb owc owd owk owo ows oww saa sab sac sad sak sao sas saw sba sbb sbc sbd sbk sbo sbs sbw sca scb scc scd sck sco scs scw sda sdb sdc sdd sdk sdo sds sdw sk- ska skb skc skd skk sko sks skw soa sob soc sod sok soo sos sow ss- ssa ssb ssc ssd ssk sso sss ssw swa swb swc swd swk swo sws waa wab wac wad wak wao was waw wba wbb wbc wbd wbo wbs wbw wca wcb wcc wcd wck wco wcs wcw wda wdb wdc wds wka wkb wkc wkd wko wks wkw woa wob woc wod wok woo wos wow wsa wsb wsc wsd wsk wso wss wsw wwa wwc wwd wwo www