skirr ksirr sikrr iskrr kisrr iksrr skrir ksrir srkir rskir krsir rksir sirkr isrkr srikr rsikr irskr riskr kirsr ikrsr krisr rkisr irksr riksr skirr ksirr sikrr iskrr kisrr iksrr skrir ksrir srkir rskir krsir rksir sirkr isrkr srikr rsikr irskr riskr kirsr ikrsr krisr rkisr irksr riksr skrri ksrri srkri rskri krsri rksri skrri ksrri srkri rskri krsri rksri srrki rsrki srrki rsrki rrski rrski krrsi rkrsi krrsi rkrsi rrksi rrksi sirrk isrrk srirk rsirk irsrk risrk sirrk isrrk srirk rsirk irsrk risrk srrik rsrik srrik rsrik rrsik rrsik irrsk rirsk irrsk rirsk rrisk rrisk kirrs ikrrs krirs rkirs irkrs rikrs kirrs ikrrs krirs rkirs irkrs rikrs krris rkris krris rkris rrkis rrkis irrks rirks irrks rirks rriks rriks
Note: these 'words' (valid or invalid) are all the permutations of the word skirr. These words are obtained by scrambling the letters in skirr.