a-a a-b a-c aaa aab aac aad aao aar aaw ab- aba abb abc abd abo abr abw ac- aca acb acc acd aco acr acw ad- ada adb adc add ado adr adw aoa aob aoc aod aoo aor aow ar- ara arb arc ard aro arr arw aw- awa awb awc awd awo awr aww baa bab bac bad bao bar baw bba bbb bbc bbd bbo bbr bbw bca bcb bcc bcd bco bcr bda bdb bdc bdd bdo bdr bdw boa bob boc bod boo bor bow bra brb brd bro brr brw bwa bwb bwc bwd bwo bwr c-- caa cab cac cad cao car caw cba cbb cbc cbd cbo cbr cbw cca ccb ccc ccd cco ccr ccw cda cdb cdc cdd cdo cdr cdw co- coa cob coc cod coo cor cow cra crb crc crd cro crr crw cw- cwa cwb cwc cwd cwo cwr daa dab dac dad dao dar daw dba dbb dbc dbd dbo dbr dca dcb dcc dcd dco dcr dcw dda ddb ddc ddd ddo ddr ddw doa dob doc dod doo dor dow dra drb drc drd dro drr drw dwa dwb dwc dwo dwr dww oaa oab oac oad oao oar oaw ob- oba obb obc obd obo obr obw oc- oca ocb occ ocd oco ocr ocw oda odb odc odd odo odr oo- ooa oob ooc ood ooo oor oow or- ora orb orc ord oro orr owa owb owc owd owo oww ra- raa rab rac rad rao rar raw rba rbb rbc rbd rbo rbr rbw rca rcb rcc rcd rco rcr rcw rda rdb rdc rdd rdo rdr roa rob roc rod roo ror row rra rrb rrc rrd rrr rwa rwb rwc rwd rwr waa wab wac wad wao war waw wba wbb wbc wbd wbo wbr wbw wca wcb wcc wcd wco wcr wcw wda wdb wdc wdr woa wob woc wod woo wor wow wr- wra wrc wrd wro wrr wrw wwa wwc wwd wwo www