-er a-a a-b aaa aab aad aae aak aao aar aaw ab- aba abb abd abe abk abo abr abw ad- ada adb add ade adk ado adr adw aea aeb aed aee aek aeo aer aew aka akb akd ake akk ako akr akw aoa aob aod aoe aok aoo aor aow ar- ara arb ard are ark aro arr arw aw- awa awb awd awe awk awo awr aww baa bab bad bae bak bao bar baw bba bbb bbd bbe bbk bbo bbr bbw bda bdb bdd bde bdk bdo bdr bdw be- bea beb bed bee bek beo ber bew bka bkb bke bkk bko bkr bkw boa bob bod boe bok boo bor bow bra brb brd bre brk bro brr brw bwa bwb bwd bwk bwo bwr daa dab dad dae dak dao dar daw dba dbb dbd dbe dbk dbo dbr dda ddb ddd dde ddk ddo ddr ddw de- dea deb ded dee dek deo der dew dka dkb dke dkk dko dkr dkw doa dob dod doe dok doo dor dow dra drb drd dre drk dro drr drw dwa dwb dwe dwo dwr dww eaa eab ead eae eak eao ear eaw eba ebb ebd ebe ebk ebo ebr ebw ed- eda edb edd ede edk edo edr edw eea eeb eed eee eek eeo eer eew eka ekb ekd eke eko ekr eo- eoa eob eod eoe eok eoo eor eow era erb erd ere erk ero err erw ewa ewb ewd ewe ewk ewo ewr eww ka- kaa kab kad kae kak kao kar kaw kba kbb kbd kbe kbk kbo kbr kbw kda kdb kde kdk kdo kdr ke- kea keb ked kee kek keo ker kew kkb kke kkk kkr koa kob kod koe kok koo kor kow kra krd krk kro krr krw kw- kwa kwd kwk kwo kww oaa oab oad oae oak oao oar oaw ob- oba obb obd obe obk obo obr obw oda odb odd ode odo odr oea oeb oed oee oeo oer oka okb okd oke okk oko okr okw oo- ooa oob ood ook ooo oor oow or- ora orb ord ore ork oro orr owa owb owd owe owk owo oww ra- raa rab rad rae rak rao rar raw rba rbb rbd rbe rbk rbo rbr rbw rda rdb rdd rde rdo rdr re- rea reb red ree rek reo rer rew rkb rke rkk rko roa rob rod roe rok roo ror row rra rrb rrd rrk rrr rwa rwb rwd rwe rwr waa wab wad wae wak wao war waw wba wbb wbd wbe wbo wbr wbw wda wdb wdr wea web wed wee wek weo wer wew wka wkb wkd wke wko wkr wkw woa wob wod woe wok woo wor wow wr- wra wrd wre wrk wro wrr wrw wwa wwd wwe wwo www