derris edrris dreris rderis erdris redris derris edrris dreris rderis erdris redris drreis rdreis drreis rdreis rrdeis rrdeis errdis rerdis errdis rerdis rredis rredis derirs edrirs dreirs rdeirs erdirs redirs deirrs edirrs dierrs iderrs eidrrs iedrrs driers rdiers dirers idrers riders irders eridrs reidrs eirdrs ierdrs riedrs iredrs derirs edrirs dreirs rdeirs erdirs redirs deirrs edirrs dierrs iderrs eidrrs iedrrs driers rdiers dirers idrers riders irders eridrs reidrs eirdrs ierdrs riedrs iredrs drries rdries drries rdries rrdies rrdies drires rdires dirres idrres ridres irdres drires rdires dirres idrres ridres irdres rrides rrides rirdes irrdes rirdes irrdes errids rerids errids rerids rreids rreids erirds reirds eirrds ierrds rierds irerds erirds reirds eirrds ierrds rierds irerds rrieds rrieds rireds irreds rireds irreds derrsi edrrsi drersi rdersi erdrsi redrsi derrsi edrrsi drersi rdersi erdrsi redrsi drresi rdresi drresi rdresi rrdesi rrdesi errdsi rerdsi errdsi rerdsi rredsi rredsi dersri edrsri dresri rdesri erdsri redsri desrri edsrri dserri sderri esdrri sedrri drseri rdseri dsreri sdreri rsderi srderi ersdri resdri esrdri serdri rsedri sredri dersri edrsri dresri rdesri erdsri redsri desrri edsrri dserri sderri esdrri sedrri drseri rdseri dsreri sdreri rsderi srderi ersdri resdri esrdri serdri rsedri sredri drrsei rdrsei drrsei rdrsei rrdsei rrdsei drsrei rdsrei dsrrei sdrrei rsdrei srdrei drsrei rdsrei dsrrei sdrrei rsdrei srdrei rrsdei rrsdei rsrdei srrdei rsrdei srrdei errsdi rersdi errsdi rersdi rresdi rresdi ersrdi resrdi esrrdi serrdi rserdi srerdi ersrdi resrdi esrrdi serrdi rserdi srerdi rrsedi rrsedi rsredi srredi rsredi srredi derisr edrisr dreisr rdeisr erdisr redisr deirsr edirsr diersr idersr eidrsr iedrsr driesr rdiesr diresr idresr ridesr irdesr eridsr reidsr eirdsr ierdsr riedsr iredsr dersir edrsir dresir rdesir erdsir redsir desrir edsrir dserir sderir esdrir sedrir drseir rdseir dsreir sdreir rsdeir srdeir ersdir resdir esrdir serdir rsedir sredir deisrr edisrr diesrr idesrr eidsrr iedsrr desirr edsirr dseirr sdeirr esdirr sedirr diserr idserr dsierr sdierr isderr siderr eisdrr iesdrr esidrr seidrr isedrr siedrr driser rdiser dirser idrser ridser irdser drsier rdsier dsrier sdrier rsdier srdier disrer idsrer dsirer sdirer isdrer sidrer risder irsder rsider srider isrder sirder erisdr reisdr eirsdr iersdr riesdr iresdr ersidr residr esridr seridr rseidr sreidr eisrdr iesrdr esirdr seirdr iserdr sierdr risedr irsedr rsiedr sriedr isredr siredr derisr edrisr dreisr rdeisr erdisr redisr deirsr edirsr diersr idersr eidrsr iedrsr driesr rdiesr diresr idresr ridesr irdesr eridsr reidsr eirdsr ierdsr riedsr iredsr dersir edrsir dresir rdesir erdsir redsir desrir edsrir dserir sderir esdrir sedrir drseir rdseir dsreir sdreir rsdeir srdeir ersdir resdir esrdir serdir rsedir sredir deisrr edisrr diesrr idesrr eidsrr iedsrr desirr edsirr dseirr sdeirr esdirr sedirr diserr idserr dsierr sdierr isderr siderr eisdrr iesdrr esidrr seidrr isedrr siedrr driser rdiser dirser idrser ridser irdser drsier rdsier dsrier sdrier rsdier srdier disrer idsrer dsirer sdirer isdrer sidrer risder irsder rsider srider isrder sirder erisdr reisdr eirsdr iersdr riesdr iresdr ersidr residr esridr seridr rseidr sreidr eisrdr iesrdr esirdr seirdr iserdr sierdr risedr irsedr rsiedr sriedr isredr siredr drrise rdrise drrise rdrise rrdise rrdise drirse rdirse dirrse idrrse ridrse irdrse drirse rdirse dirrse idrrse ridrse irdrse rridse rridse rirdse irrdse rirdse irrdse drrsie rdrsie drrsie rdrsie rrdsie rrdsie drsrie rdsrie dsrrie sdrrie rsdrie srdrie drsrie rdsrie dsrrie sdrrie rsdrie srdrie rrsdie rrsdie rsrdie srrdie rsrdie srrdie drisre rdisre dirsre idrsre ridsre irdsre drsire rdsire dsrire sdrire rsdire srdire disrre idsrre dsirre sdirre isdrre sidrre risdre irsdre rsidre sridre isrdre sirdre drisre rdisre dirsre idrsre ridsre irdsre drsire rdsire dsrire sdrire rsdire srdire disrre idsrre dsirre sdirre isdrre sidrre risdre irsdre rsidre sridre isrdre sirdre rrisde rrisde rirsde irrsde rirsde irrsde rrside rrside rsride srride rsride srride risrde irsrde rsirde srirde isrrde sirrde risrde irsrde rsirde srirde isrrde sirrde errisd rerisd errisd rerisd rreisd rreisd erirsd reirsd eirrsd ierrsd riersd irersd erirsd reirsd eirrsd ierrsd riersd irersd rriesd rriesd riresd irresd riresd irresd errsid rersid errsid rersid rresid rresid ersrid resrid esrrid serrid rserid srerid ersrid resrid esrrid serrid rserid srerid rrseid rrseid rsreid srreid rsreid srreid erisrd reisrd eirsrd iersrd riesrd iresrd ersird resird esrird serird rseird sreird eisrrd iesrrd esirrd seirrd iserrd sierrd riserd irserd rsierd srierd isrerd sirerd erisrd reisrd eirsrd iersrd riesrd iresrd ersird resird esrird serird rseird sreird eisrrd iesrrd esirrd seirrd iserrd sierrd riserd irserd rsierd srierd isrerd sirerd rrised rrised rirsed irrsed rirsed irrsed rrsied rrsied rsried srried rsried srried risred irsred rsired srired isrred sirred risred irsred rsired srired isrred sirred
Note: these 'words' (valid or invalid) are all the permutations of the word derris. These words are obtained by scrambling the letters in derris.