a-a a-b a-c aaa aab aac aad aak aao aar aaw ab- aba abb abc abd abk abo abr abw ac- aca acb acc acd ack aco acr acw ad- ada adb adc add adk ado adr adw aka akb akc akd akk ako akr akw aoa aob aoc aod aok aoo aor aow ar- ara arb arc ard ark aro arr arw aw- awa awb awc awd awk awo awr aww baa bab bac bad bak bao bar baw bba bbb bbc bbd bbk bbo bbr bbw bca bcb bcc bcd bck bco bcr bda bdb bdc bdd bdk bdo bdr bdw bka bkb bkc bkk bko bkr bkw boa bob boc bod bok boo bor bow bra brb brd brk bro brr brw bwa bwb bwc bwd bwk bwo bwr c-- caa cab cac cad cak cao car caw cba cbb cbc cbd cbk cbo cbr cbw cca ccb ccc ccd cck cco ccr ccw cda cdb cdc cdd cdk cdo cdr cdw cka ckb ckc ckd cko ckw co- coa cob coc cod cok coo cor cow cra crb crc crd crk cro crr crw cw- cwa cwb cwc cwd cwk cwo cwr daa dab dac dad dak dao dar daw dba dbb dbc dbd dbk dbo dbr dca dcb dcc dcd dck dco dcr dcw dda ddb ddc ddd ddk ddo ddr ddw dka dkb dkc dkk dko dkr dkw doa dob doc dod dok doo dor dow dra drb drc drd drk dro drr drw dwa dwb dwc dwo dwr dww ka- kaa kab kac kad kak kao kar kaw kba kbb kbc kbd kbk kbo kbr kbw kca kcb kcc kcd kck kcr kda kdb kdc kdk kdo kdr kkb kkc kkk kkr koa kob koc kod kok koo kor kow kra krc krd krk kro krr krw kw- kwa kwc kwd kwk kwo kww oaa oab oac oad oak oao oar oaw ob- oba obb obc obd obk obo obr obw oc- oca ocb occ ocd ock oco ocr ocw oda odb odc odd odo odr oka okb okc okd okk oko okr okw oo- ooa oob ooc ood ook ooo oor oow or- ora orb orc ord ork oro orr owa owb owc owd owk owo oww ra- raa rab rac rad rak rao rar raw rba rbb rbc rbd rbk rbo rbr rbw rca rcb rcc rcd rco rcr rcw rda rdb rdc rdd rdo rdr rkb rkc rkk rko roa rob roc rod rok roo ror row rra rrb rrc rrd rrk rrr rwa rwb rwc rwd rwr waa wab wac wad wak wao war waw wba wbb wbc wbd wbo wbr wbw wca wcb wcc wcd wck wco wcr wcw wda wdb wdc wdr wka wkb wkc wkd wko wkr wkw woa wob woc wod wok woo wor wow wr- wra wrc wrd wrk wro wrr wrw wwa wwc wwd wwo www