a-a a-b a-c a-z aaa aab aac aad aao aaw aaz ab- aba abb abc abd abo abw abz ac- aca acb acc acd aco acw acz ad- ada adb adc add ado adw adz aoa aob aoc aod aoo aow aw- awa awb awc awd awo aww az- aza azb azd azo azw azz baa bab bac bad bao baw baz bba bbb bbc bbd bbo bbw bca bcb bcc bcd bco bcz bda bdb bdc bdd bdo bdw bdz boa bob boc bod boo bow boz bwa bwb bwc bwd bwo bza bzd bzo bzz c-- caa cab cac cad cao caw caz cba cbb cbc cbd cbo cbw cbz cca ccb ccc ccd cco ccw ccz cda cdb cdc cdd cdo cdw cdz co- coa cob coc cod coo cow coz cw- cwa cwb cwc cwd cwo cz- czc czd czo czw daa dab dac dad dao daw daz dba dbb dbc dbd dbo dbz dca dcb dcc dcd dco dcw dda ddb ddc ddd ddo ddw ddz doa dob doc dod doo dow doz dwa dwb dwc dwo dww dza dzb dzd dzo oaa oab oac oad oao oaw ob- oba obb obc obd obo obw oc- oca ocb occ ocd oco ocw ocz oda odb odc odd odo oo- ooa oob ooc ood ooo oow owa owb owc owd owo oww oza ozo ozw ozz waa wab wac wad wao waw waz wba wbb wbc wbd wbo wbw wbz wca wcb wcc wcd wco wcw wda wdb wdc wdz woa wob woc wod woo wow woz wwa wwc wwd wwo www wzc zaa zab zac zad zao zaz zbb zbc zbw zco zo- zoa zob zoc zod zoo zow zzz