drills rdills dirlls idrlls ridlls irdlls drlils rdlils dlrils ldrils rldils lrdils dilrls idlrls dlirls ldirls ildrls lidrls rildls irldls rlidls lridls ilrdls lirdls drills rdills dirlls idrlls ridlls irdlls drlils rdlils dlrils ldrils rldils lrdils dilrls idlrls dlirls ldirls ildrls lidrls rildls irldls rlidls lridls ilrdls lirdls drllis rdllis dlrlis ldrlis rldlis lrdlis drllis rdllis dlrlis ldrlis rldlis lrdlis dllris ldlris dllris ldlris lldris lldris rlldis lrldis rlldis lrldis llrdis llrdis dillrs idllrs dlilrs ldilrs ildlrs lidlrs dillrs idllrs dlilrs ldilrs ildlrs lidlrs dllirs ldlirs dllirs ldlirs lldirs lldirs illdrs lildrs illdrs lildrs llidrs llidrs rillds irllds rlilds lrilds ilrlds lirlds rillds irllds rlilds lrilds ilrlds lirlds rllids lrlids rllids lrlids llrids llrids illrds lilrds illrds lilrds llirds llirds drilsl rdilsl dirlsl idrlsl ridlsl irdlsl drlisl rdlisl dlrisl ldrisl rldisl lrdisl dilrsl idlrsl dlirsl ldirsl ildrsl lidrsl rildsl irldsl rlidsl lridsl ilrdsl lirdsl drisll rdisll dirsll idrsll ridsll irdsll drsill rdsill dsrill sdrill rsdill srdill disrll idsrll dsirll sdirll isdrll sidrll risdll irsdll rsidll sridll isrdll sirdll drlsil rdlsil dlrsil ldrsil rldsil lrdsil drslil rdslil dsrlil sdrlil rsdlil srdlil dlsril ldsril dslril sdlril lsdril sldril rlsdil lrsdil rsldil srldil lsrdil slrdil dilsrl idlsrl dlisrl ldisrl ildsrl lidsrl dislrl idslrl dsilrl sdilrl isdlrl sidlrl dlsirl ldsirl dslirl sdlirl lsdirl sldirl ilsdrl lisdrl isldrl sildrl lsidrl slidrl rilsdl irlsdl rlisdl lrisdl ilrsdl lirsdl risldl irsldl rsildl srildl isrldl sirldl rlsidl lrsidl rslidl srlidl lsridl slridl ilsrdl lisrdl islrdl silrdl lsirdl slirdl drilsl rdilsl dirlsl idrlsl ridlsl irdlsl drlisl rdlisl dlrisl ldrisl rldisl lrdisl dilrsl idlrsl dlirsl ldirsl ildrsl lidrsl rildsl irldsl rlidsl lridsl ilrdsl lirdsl drisll rdisll dirsll idrsll ridsll irdsll drsill rdsill dsrill sdrill rsdill srdill disrll idsrll dsirll sdirll isdrll sidrll risdll irsdll rsidll sridll isrdll sirdll drlsil rdlsil dlrsil ldrsil rldsil lrdsil drslil rdslil dsrlil sdrlil rsdlil srdlil dlsril ldsril dslril sdlril lsdril sldril rlsdil lrsdil rsldil srldil lsrdil slrdil dilsrl idlsrl dlisrl ldisrl ildsrl lidsrl dislrl idslrl dsilrl sdilrl isdlrl sidlrl dlsirl ldsirl dslirl sdlirl lsdirl sldirl ilsdrl lisdrl isldrl sildrl lsidrl slidrl rilsdl irlsdl rlisdl lrisdl ilrsdl lirsdl risldl irsldl rsildl srildl isrldl sirldl rlsidl lrsidl rslidl srlidl lsridl slridl ilsrdl lisrdl islrdl silrdl lsirdl slirdl drllsi rdllsi dlrlsi ldrlsi rldlsi lrdlsi drllsi rdllsi dlrlsi ldrlsi rldlsi lrdlsi dllrsi ldlrsi dllrsi ldlrsi lldrsi lldrsi rlldsi lrldsi rlldsi lrldsi llrdsi llrdsi drlsli rdlsli dlrsli ldrsli rldsli lrdsli drslli rdslli dsrlli sdrlli rsdlli srdlli dlsrli ldsrli dslrli sdlrli lsdrli sldrli rlsdli lrsdli rsldli srldli lsrdli slrdli drlsli rdlsli dlrsli ldrsli rldsli lrdsli drslli rdslli dsrlli sdrlli rsdlli srdlli dlsrli ldsrli dslrli sdlrli lsdrli sldrli rlsdli lrsdli rsldli srldli lsrdli slrdli dllsri ldlsri dllsri ldlsri lldsri lldsri dlslri ldslri dsllri sdllri lsdlri sldlri dlslri ldslri dsllri sdllri lsdlri sldlri llsdri llsdri lsldri slldri lsldri slldri rllsdi lrlsdi rllsdi lrlsdi llrsdi llrsdi rlsldi lrsldi rslldi srlldi lsrldi slrldi rlsldi lrsldi rslldi srlldi lsrldi slrldi llsrdi llsrdi lslrdi sllrdi lslrdi sllrdi dillsr idllsr dlilsr ldilsr ildlsr lidlsr dillsr idllsr dlilsr ldilsr ildlsr lidlsr dllisr ldlisr dllisr ldlisr lldisr lldisr illdsr lildsr illdsr lildsr llidsr llidsr dilslr idlslr dlislr ldislr ildslr lidslr disllr idsllr dsillr sdillr isdllr sidllr dlsilr ldsilr dslilr sdlilr lsdilr sldilr ilsdlr lisdlr isldlr sildlr lsidlr slidlr dilslr idlslr dlislr ldislr ildslr lidslr disllr idsllr dsillr sdillr isdllr sidllr dlsilr ldsilr dslilr sdlilr lsdilr sldilr ilsdlr lisdlr isldlr sildlr lsidlr slidlr dllsir ldlsir dllsir ldlsir lldsir lldsir dlslir ldslir dsllir sdllir lsdlir sldlir dlslir ldslir dsllir sdllir lsdlir sldlir llsdir llsdir lsldir slldir lsldir slldir illsdr lilsdr illsdr lilsdr llisdr llisdr ilsldr lisldr islldr silldr lsildr slildr ilsldr lisldr islldr silldr lsildr slildr llsidr llsidr lslidr sllidr lslidr sllidr rillsd irllsd rlilsd lrilsd ilrlsd lirlsd rillsd irllsd rlilsd lrilsd ilrlsd lirlsd rllisd lrlisd rllisd lrlisd llrisd llrisd illrsd lilrsd illrsd lilrsd llirsd llirsd rilsld irlsld rlisld lrisld ilrsld lirsld rislld irslld rsilld srilld isrlld sirlld rlsild lrsild rslild srlild lsrild slrild ilsrld lisrld islrld silrld lsirld slirld rilsld irlsld rlisld lrisld ilrsld lirsld rislld irslld rsilld srilld isrlld sirlld rlsild lrsild rslild srlild lsrild slrild ilsrld lisrld islrld silrld lsirld slirld rllsid lrlsid rllsid lrlsid llrsid llrsid rlslid lrslid rsllid srllid lsrlid slrlid rlslid lrslid rsllid srllid lsrlid slrlid llsrid llsrid lslrid sllrid lslrid sllrid illsrd lilsrd illsrd lilsrd llisrd llisrd ilslrd lislrd isllrd sillrd lsilrd slilrd ilslrd lislrd isllrd sillrd lsilrd slilrd llsird llsird lslird sllird lslird sllird
Note: these 'words' (valid or invalid) are all the permutations of the word drills. These words are obtained by scrambling the letters in drills.