sarin asrin srain rsain arsin rasin sairn asirn siarn isarn aisrn iasrn srian rsian siran isran risan irsan arisn raisn airsn iarsn riasn irasn sarni asrni srani rsani arsni rasni sanri asnri snari nsari ansri nasri srnai rsnai snrai nsrai rnsai nrsai arnsi ransi anrsi narsi rnasi nrasi sainr asinr sianr isanr aisnr iasnr sanir asnir snair nsair ansir nasir sinar isnar sniar nsiar insar nisar ainsr iansr anisr naisr inasr niasr srina rsina sirna isrna risna irsna srnia rsnia snria nsria rnsia nrsia sinra isnra snira nsira insra nisra rinsa irnsa rnisa nrisa inrsa nirsa arins rains airns iarns rians irans arnis ranis anris naris rnais nrais ainrs ianrs anirs nairs inars niars rinas irnas rnias nrias inras niras
Note: these 'words' (valid or invalid) are all the permutations of the word sarin. These words are obtained by scrambling the letters in sarin.