checks hcecks cehcks echcks heccks ehccks chceks hcceks ccheks ccheks hcceks chceks cechks ecchks ccehks ccehks ecchks cechks heccks ehccks hcecks checks echcks cehcks chekcs hcekcs cehkcs echkcs heckcs ehckcs chkecs hckecs ckhecs kchecs hkcecs khcecs cekhcs eckhcs ckehcs kcehcs ekchcs kechcs hekccs ehkccs hkeccs kheccs ekhccs kehccs chckes hcckes cchkes cchkes hcckes chckes chkces hckces ckhces kchces hkcces khcces cckhes cckhes ckches kcches ckches kcches hckces chkces hkcces khcces ckhces kchces ceckhs ecckhs ccekhs ccekhs ecckhs ceckhs cekchs eckchs ckechs kcechs ekcchs kecchs cckehs cckehs ckcehs kccehs ckcehs kccehs eckchs cekchs ekcchs kecchs ckechs kcechs heckcs ehckcs hcekcs chekcs echkcs cehkcs hekccs ehkccs hkeccs kheccs ekhccs kehccs hckecs chkecs hkcecs khcecs ckhecs kchecs eckhcs cekhcs ekchcs kechcs ckehcs kcehcs checsk hcecsk cehcsk echcsk heccsk ehccsk chcesk hccesk cchesk cchesk hccesk chcesk cechsk ecchsk ccehsk ccehsk ecchsk cechsk heccsk ehccsk hcecsk checsk echcsk cehcsk chesck hcesck cehsck echsck hecsck ehcsck chseck hcseck csheck scheck hsceck shceck ceshck ecshck csehck scehck eschck sechck hescck ehscck hsecck shecck eshcck sehcck chcsek hccsek cchsek cchsek hccsek chcsek chscek hcscek cshcek schcek hsccek shccek ccshek ccshek cschek scchek cschek scchek hcscek chscek hsccek shccek cshcek schcek cecshk eccshk cceshk cceshk eccshk cecshk ceschk ecschk csechk scechk escchk secchk ccsehk ccsehk cscehk sccehk cscehk sccehk ecschk ceschk escchk secchk csechk scechk hecsck ehcsck hcesck chesck echsck cehsck hescck ehscck hsecck shecck eshcck sehcck hcseck chseck hsceck shceck csheck scheck ecshck ceshck eschck sechck csehck scehck cheksc hceksc cehksc echksc hecksc ehcksc chkesc hckesc ckhesc kchesc hkcesc khcesc cekhsc eckhsc ckehsc kcehsc ekchsc kechsc hekcsc ehkcsc hkecsc khecsc ekhcsc kehcsc cheskc hceskc cehskc echskc hecskc ehcskc chsekc hcsekc cshekc schekc hscekc shcekc ceshkc ecshkc csehkc scehkc eschkc sechkc hesckc ehsckc hseckc sheckc eshckc sehckc chksec hcksec ckhsec kchsec hkcsec khcsec chskec hcskec cshkec schkec hsckec shckec ckshec kcshec cskhec sckhec kschec skchec hkscec khscec hskcec shkcec kshcec skhcec cekshc eckshc ckeshc kceshc ekcshc kecshc ceskhc ecskhc csekhc scekhc esckhc seckhc cksehc kcsehc cskehc sckehc kscehc skcehc ekschc keschc eskchc sekchc ksechc skechc hekscc ehkscc hkescc khescc ekhscc kehscc heskcc ehskcc hsekcc shekcc eshkcc sehkcc hksecc khsecc hskecc shkecc kshecc skhecc ekshcc keshcc eskhcc sekhcc ksehcc skehcc chckse hcckse cchkse cchkse hcckse chckse chkcse hckcse ckhcse kchcse hkccse khccse cckhse cckhse ckchse kcchse ckchse kcchse hckcse chkcse hkccse khccse ckhcse kchcse chcske hccske cchske cchske hccske chcske chscke hcscke cshcke schcke hsccke shccke ccshke ccshke cschke scchke cschke scchke hcscke chscke hsccke shccke cshcke schcke chksce hcksce ckhsce kchsce hkcsce khcsce chskce hcskce cshkce schkce hsckce shckce ckshce kcshce cskhce sckhce kschce skchce hkscce khscce hskcce shkcce kshcce skhcce cckshe cckshe ckcshe kccshe ckcshe kccshe ccskhe ccskhe csckhe scckhe csckhe scckhe cksche kcsche cskche sckche kscche skcche cksche kcsche cskche sckche kscche skcche hcksce chksce hkcsce khcsce ckhsce kchsce hcskce chskce hsckce shckce cshkce schkce hkscce khscce hskcce shkcce kshcce skhcce ckshce kcshce cskhce sckhce kschce skchce cecksh eccksh cceksh cceksh eccksh cecksh cekcsh eckcsh ckecsh kcecsh ekccsh keccsh cckesh cckesh ckcesh kccesh ckcesh kccesh eckcsh cekcsh ekccsh keccsh ckecsh kcecsh cecskh eccskh cceskh cceskh eccskh cecskh cesckh ecsckh cseckh sceckh escckh secckh ccsekh ccsekh cscekh sccekh cscekh sccekh ecsckh cesckh escckh secckh cseckh sceckh ceksch ecksch ckesch kcesch ekcsch kecsch ceskch ecskch csekch scekch esckch seckch cksech kcsech cskech sckech kscech skcech ekscch kescch eskcch sekcch ksecch skecch cckseh cckseh ckcseh kccseh ckcseh kccseh ccskeh ccskeh csckeh scckeh csckeh scckeh cksceh kcsceh cskceh sckceh kscceh skcceh cksceh kcsceh cskceh sckceh kscceh skcceh ecksch ceksch ekcsch kecsch ckesch kcesch ecskch ceskch esckch seckch csekch scekch ekscch kescch eskcch sekcch ksecch skecch cksech kcsech cskech sckech kscech skcech hecksc ehcksc hceksc cheksc echksc cehksc hekcsc ehkcsc hkecsc khecsc ekhcsc kehcsc hckesc chkesc hkcesc khcesc ckhesc kchesc eckhsc cekhsc ekchsc kechsc ckehsc kcehsc hecskc ehcskc hceskc cheskc echskc cehskc hesckc ehsckc hseckc sheckc eshckc sehckc hcsekc chsekc hscekc shcekc cshekc schekc ecshkc ceshkc eschkc sechkc csehkc scehkc hekscc ehkscc hkescc khescc ekhscc kehscc heskcc ehskcc hsekcc shekcc eshkcc sehkcc hksecc khsecc hskecc shkecc kshecc skhecc ekshcc keshcc eskhcc sekhcc ksehcc skehcc hcksec chksec hkcsec khcsec ckhsec kchsec hcskec chskec hsckec shckec cshkec schkec hkscec khscec hskcec shkcec kshcec skhcec ckshec kcshec cskhec sckhec kschec skchec eckshc cekshc ekcshc kecshc ckeshc kceshc ecskhc ceskhc esckhc seckhc csekhc scekhc ekschc keschc eskchc sekchc ksechc skechc cksehc kcsehc cskehc sckehc kscehc skcehc
Note: these 'words' (valid or invalid) are all the permutations of the word checks. These words are obtained by scrambling the letters in checks.