a-a a-b a-c aaa aab aac aad aak aao aaw ab- aba abb abc abd abk abo abw ac- aca acb acc acd ack aco acw ad- ada adb adc add adk ado adw aka akb akc akd akk ako akw aoa aob aoc aod aok aoo aow aw- awa awb awc awd awk awo aww baa bab bac bad bak bao baw bba bbb bbc bbd bbk bbo bbw bca bcb bcc bcd bck bco bda bdb bdc bdd bdk bdo bdw bka bkb bkc bkk bko bkw boa bob boc bod bok boo bow bwa bwb bwc bwd bwk bwo c-- caa cab cac cad cak cao caw cba cbb cbc cbd cbk cbo cbw cca ccb ccc ccd cck cco ccw cda cdb cdc cdd cdk cdo cdw cka ckb ckc ckd cko ckw co- coa cob coc cod cok coo cow cw- cwa cwb cwc cwd cwk cwo daa dab dac dad dak dao daw dba dbb dbc dbd dbk dbo dca dcb dcc dcd dck dco dcw dda ddb ddc ddd ddk ddo ddw dka dkb dkc dkk dko dkw doa dob doc dod dok doo dow dwa dwb dwc dwo dww ka- kaa kab kac kad kak kao kaw kba kbb kbc kbd kbk kbo kbw kca kcb kcc kcd kck kda kdb kdc kdk kdo kkb kkc kkk koa kob koc kod kok koo kow kw- kwa kwc kwd kwk kwo kww oaa oab oac oad oak oao oaw ob- oba obb obc obd obk obo obw oc- oca ocb occ ocd ock oco ocw oda odb odc odd odo oka okb okc okd okk oko okw oo- ooa oob ooc ood ook ooo oow owa owb owc owd owk owo oww waa wab wac wad wak wao waw wba wbb wbc wbd wbo wbw wca wcb wcc wcd wck wco wcw wda wdb wdc wka wkb wkc wkd wko wkw woa wob woc wod wok woo wow wwa wwc wwd wwo www