-er eee eeo eer eet eex eo- eoe eoo eor eot ere ero err ert ete eto etr ett etx ex- exe exo exr ext exx oee oeo oer oet oex oo- ooo oor oot oox or- ore oro orr ort orx ot- ote oto otr ott ox- oxo oxt oxx re- ree reo rer ret rex roe roo ror rot rox rrr rrt rte rto rtr rtt rtx rxr t-x te- tee teo ter tet tex to- toe too tor tot tox tre tro trr trt trx tte tto ttr ttt ttx txe txt xee xer xet xex xoo xor xot xox xrt xrx xtr xtx xxo xxx

eeee eero eete eext eore eoto er-x erer eret eroe eroo erre erro etee eter etoe etox etre etro ette etto exer exo- exor exrx exte extr o-eo oere ooer oooo oore oort ore- oreo orer orex oro- oroe oror orot orro orte orto otee oter oto- otoe otoo otor otre otro otte otto oxer oxo- oxox oxxo reet reot rere rero rert rete reto retr rett rexx roer roet roor root roox rore roro rort rote roto rotr rott roxo rrrr rtee rtex teer teet teor ter- tere tero terr tete teto tetr tett tetx text toee toer toet toor toot tore toro torr tort torx tote toto totr tott tox- toxo toxt tre- tree treo tret trex troe troo trot trox trte trtr tteo tter ttoe tttt txtr xeer xer- xero xert xexe xoro xote xoxo xtro xxxo xxxx

-tree eeeee eorre erere eroor erore eroto error erte erter etete etext etoro etree etter exert exore exort exter extre extro oo-er ooooo oreo- orere orero orexo oroer orret orter ortet ortoo otere otero ototo otter oxter reere reorx rere- reree reret retee reter retex retox retro rette retto rexer ro-ro roero rooer roore roote rorer roter roto- rotor rotot rotox rotte rotto rtext t-rex teret terex teror terre terro tert- teter tetex tetr- tetro tette texor texte toerr toeto toore toreo toret torre torro torte torto torxe toter totex toto- totoe totoo totte toxo- treer treet trere trete trett troee trott ttttt xero- xerox xerte xetex xexex xootr xorro xotox xoxox xtext xtort xtree

e-text eototo eroto- errett etoeot ettore exeter exorte extort extro- oerter oooooo ottoor oxeote r-tree reroot reteer reteet reteoo retere retore retort retree retret retro- retrot retter rooter rootte rorter rotter t-tree teetee teeter terete terreo terrer terret terrex terror terrot terter tertre tetete tetter texter toetoe tooter tootoo torero tororo torret torrox tortor totoro totrot totter treete tretee trette trotro trotte x-tree xerert xooter xoxoxo

eeeroer exterro ottetto ottrott reexert reteere reterre retrete rettert rettore rootrot roxette terere tereto- terreer terrere tettete toe-toe too-too torrert tototoo treetee trettre tro-tro trottee trotter xeroxer xxxxxxx

extorter extortor retorter teetoter toetotoe toottoot torotoro totterer treeroot xoxoxoxo

exerttrex retrotort rotrooter tortoreto

rotorooter toe-to-toe

roto-rooter

teetertotter xxxxxxxxxxxx

teeter-totter tetter-totter