-er a-a a-b aaa aab aae aao aar aaw ab- aba abb abe abo abr abw aea aeb aee aeo aer aew aoa aob aoe aoo aor aow ar- ara arb are aro arr arw aw- awa awb awe awo awr aww baa bab bae bao bar baw bba bbb bbe bbo bbr bbw be- bea beb bee beo ber bew boa bob boe boo bor bow bra brb bre bro brr brw bwa bwb bwo bwr eaa eab eae eao ear eaw eba ebb ebe ebo ebr ebw eea eeb eee eeo eer eew eo- eoa eob eoe eoo eor eow era erb ere ero err erw ewa ewb ewe ewo ewr eww oaa oab oae oao oar oaw ob- oba obb obe obo obr obw oea oeb oee oeo oer oo- ooa oob ooo oor oow or- ora orb ore oro orr owa owb owe owo oww ra- raa rab rae rao rar raw rba rbb rbe rbo rbr rbw re- rea reb ree reo rer rew roa rob roe roo ror row rra rrb rrr rwa rwb rwe rwr waa wab wae wao war waw wba wbb wbe wbo wbr wbw wea web wee weo wer wew woa wob woe woo wor wow wr- wra wre wro wrr wrw wwa wwe wwo www