thirds htirds tihrds ithrds hitrds ihtrds thrids htrids trhids rthids hrtids rhtids tirhds itrhds trihds rtihds irthds rithds hirtds ihrtds hritds rhitds irhtds rihtds thidrs htidrs tihdrs ithdrs hitdrs ihtdrs thdirs htdirs tdhirs dthirs hdtirs dhtirs tidhrs itdhrs tdihrs dtihrs idthrs dithrs hidtrs ihdtrs hditrs dhitrs idhtrs dihtrs thrdis htrdis trhdis rthdis hrtdis rhtdis thdris htdris tdhris dthris hdtris dhtris trdhis rtdhis tdrhis dtrhis rdthis drthis hrdtis rhdtis hdrtis dhrtis rdhtis drhtis tirdhs itrdhs tridhs rtidhs irtdhs ritdhs tidrhs itdrhs tdirhs dtirhs idtrhs ditrhs trdihs rtdihs tdrihs dtrihs rdtihs drtihs irdths ridths idrths dirths rdiths driths hirdts ihrdts hridts rhidts irhdts rihdts hidrts ihdrts hdirts dhirts idhrts dihrts hrdits rhdits hdrits dhrits rdhits drhits irdhts ridhts idrhts dirhts rdihts drihts thirsd htirsd tihrsd ithrsd hitrsd ihtrsd thrisd htrisd trhisd rthisd hrtisd rhtisd tirhsd itrhsd trihsd rtihsd irthsd rithsd hirtsd ihrtsd hritsd rhitsd irhtsd rihtsd thisrd htisrd tihsrd ithsrd hitsrd ihtsrd thsird htsird tshird sthird hstird shtird tishrd itshrd tsihrd stihrd isthrd sithrd histrd ihstrd hsitrd shitrd ishtrd sihtrd thrsid htrsid trhsid rthsid hrtsid rhtsid thsrid htsrid tshrid sthrid hstrid shtrid trshid rtshid tsrhid strhid rsthid srthid hrstid rhstid hsrtid shrtid rshtid srhtid tirshd itrshd trishd rtishd irtshd ritshd tisrhd itsrhd tsirhd stirhd istrhd sitrhd trsihd rtsihd tsrihd strihd rstihd srtihd irsthd risthd isrthd sirthd rsithd srithd hirstd ihrstd hristd rhistd irhstd rihstd hisrtd ihsrtd hsirtd shirtd ishrtd sihrtd hrsitd rhsitd hsritd shritd rshitd srhitd irshtd rishtd isrhtd sirhtd rsihtd srihtd thidsr htidsr tihdsr ithdsr hitdsr ihtdsr thdisr htdisr tdhisr dthisr hdtisr dhtisr tidhsr itdhsr tdihsr dtihsr idthsr dithsr hidtsr ihdtsr hditsr dhitsr idhtsr dihtsr thisdr htisdr tihsdr ithsdr hitsdr ihtsdr thsidr htsidr tshidr sthidr hstidr shtidr tishdr itshdr tsihdr stihdr isthdr sithdr histdr ihstdr hsitdr shitdr ishtdr sihtdr thdsir htdsir tdhsir dthsir hdtsir dhtsir thsdir htsdir tshdir sthdir hstdir shtdir tdshir dtshir tsdhir stdhir dsthir sdthir hdstir dhstir hsdtir shdtir dshtir sdhtir tidshr itdshr tdishr dtishr idtshr ditshr tisdhr itsdhr tsidhr stidhr istdhr sitdhr tdsihr dtsihr tsdihr stdihr dstihr sdtihr idsthr disthr isdthr sidthr dsithr sdithr hidstr ihdstr hdistr dhistr idhstr dihstr hisdtr ihsdtr hsidtr shidtr ishdtr sihdtr hdsitr dhsitr hsditr shditr dshitr sdhitr idshtr dishtr isdhtr sidhtr dsihtr sdihtr thrdsi htrdsi trhdsi rthdsi hrtdsi rhtdsi thdrsi htdrsi tdhrsi dthrsi hdtrsi dhtrsi trdhsi rtdhsi tdrhsi dtrhsi rdthsi drthsi hrdtsi rhdtsi hdrtsi dhrtsi rdhtsi drhtsi thrsdi htrsdi trhsdi rthsdi hrtsdi rhtsdi thsrdi htsrdi tshrdi sthrdi hstrdi shtrdi trshdi rtshdi tsrhdi strhdi rsthdi srthdi hrstdi rhstdi hsrtdi shrtdi rshtdi srhtdi thdsri htdsri tdhsri dthsri hdtsri dhtsri thsdri htsdri tshdri sthdri hstdri shtdri tdshri dtshri tsdhri stdhri dsthri sdthri hdstri dhstri hsdtri shdtri dshtri sdhtri trdshi rtdshi tdrshi dtrshi rdtshi drtshi trsdhi rtsdhi tsrdhi strdhi rstdhi srtdhi tdsrhi dtsrhi tsdrhi stdrhi dstrhi sdtrhi rdsthi drsthi rsdthi srdthi dsrthi sdrthi hrdsti rhdsti hdrsti dhrsti rdhsti drhsti hrsdti rhsdti hsrdti shrdti rshdti srhdti hdsrti dhsrti hsdrti shdrti dshrti sdhrti rdshti drshti rsdhti srdhti dsrhti sdrhti tirdsh itrdsh tridsh rtidsh irtdsh ritdsh tidrsh itdrsh tdirsh dtirsh idtrsh ditrsh trdish rtdish tdrish dtrish rdtish drtish irdtsh ridtsh idrtsh dirtsh rditsh dritsh tirsdh itrsdh trisdh rtisdh irtsdh ritsdh tisrdh itsrdh tsirdh stirdh istrdh sitrdh trsidh rtsidh tsridh stridh rstidh srtidh irstdh ristdh isrtdh sirtdh rsitdh sritdh tidsrh itdsrh tdisrh dtisrh idtsrh ditsrh tisdrh itsdrh tsidrh stidrh istdrh sitdrh tdsirh dtsirh tsdirh stdirh dstirh sdtirh idstrh distrh isdtrh sidtrh dsitrh sditrh trdsih rtdsih tdrsih dtrsih rdtsih drtsih trsdih rtsdih tsrdih strdih rstdih srtdih tdsrih dtsrih tsdrih stdrih dstrih sdtrih rdstih drstih rsdtih srdtih dsrtih sdrtih irdsth ridsth idrsth dirsth rdisth dristh irsdth risdth isrdth sirdth rsidth sridth idsrth disrth isdrth sidrth dsirth sdirth rdsith drsith rsdith srdith dsrith sdrith hirdst ihrdst hridst rhidst irhdst rihdst hidrst ihdrst hdirst dhirst idhrst dihrst hrdist rhdist hdrist dhrist rdhist drhist irdhst ridhst idrhst dirhst rdihst drihst hirsdt ihrsdt hrisdt rhisdt irhsdt rihsdt hisrdt ihsrdt hsirdt shirdt ishrdt sihrdt hrsidt rhsidt hsridt shridt rshidt srhidt irshdt rishdt isrhdt sirhdt rsihdt srihdt hidsrt ihdsrt hdisrt dhisrt idhsrt dihsrt hisdrt ihsdrt hsidrt shidrt ishdrt sihdrt hdsirt dhsirt hsdirt shdirt dshirt sdhirt idshrt dishrt isdhrt sidhrt dsihrt sdihrt hrdsit rhdsit hdrsit dhrsit rdhsit drhsit hrsdit rhsdit hsrdit shrdit rshdit srhdit hdsrit dhsrit hsdrit shdrit dshrit sdhrit rdshit drshit rsdhit srdhit dsrhit sdrhit irdsht ridsht idrsht dirsht rdisht drisht irsdht risdht isrdht sirdht rsidht sridht idsrht disrht isdrht sidrht dsirht sdirht rdsiht drsiht rsdiht srdiht dsriht sdriht
Note: these 'words' (valid or invalid) are all the permutations of the word thirds. These words are obtained by scrambling the letters in thirds.