-er a-a a-b a-z aaa aab aad aae aao aar aaz ab- aba abb abd abe abo abr abz ad- ada adb add ade ado adr adz aea aeb aed aee aeo aer aez aoa aob aod aoe aoo aor ar- ara arb ard are aro arr arz az- aza azb azd aze azo azz baa bab bad bae bao bar baz bba bbb bbd bbe bbo bbr bda bdb bdd bde bdo bdr bdz be- bea beb bed bee beo ber bez boa bob bod boe boo bor boz bra brb brd bre bro brr brz bza bzd bze bzo bzr bzz daa dab dad dae dao dar daz dba dbb dbd dbe dbo dbr dbz dda ddb ddd dde ddo ddr ddz de- dea deb ded dee deo der dez doa dob dod doe doo dor doz dra drb drd dre dro drr drz dza dzb dzd dze dzo dzr eaa eab ead eae eao ear eaz eba ebb ebd ebe ebo ebr ed- eda edb edd ede edo edr eea eeb eed eee eeo eer eo- eoa eob eod eoe eoo eor era erb erd ere ero err erz eze ezo ezr ezz oaa oab oad oae oao oar ob- oba obb obd obe obo obr oda odb odd ode odo odr oea oeb oed oee oeo oer oo- ooa oob ood ooo oor or- ora orb ord ore oro orr orz oza oze ozo ozz ra- raa rab rad rae rao rar raz rba rbb rbd rbe rbo rbr rda rdb rdd rde rdo rdr re- rea reb red ree reo rer rez roa rob rod roe roo ror roz rra rrb rrd rrr rza rzb rze rzo zaa zab zad zao zar zaz zbb zbr zea zeb zed zee zeo zer zez zo- zoa zob zod zoe zoo zor zro zzr zzz