stair tsair satir astir tasir atsir stiar tsiar sitar istar tisar itsar saitr asitr siatr isatr aistr iastr taisr atisr tiasr itasr aitsr iatsr stari tsari satri astri tasri atsri strai tsrai srtai rstai trsai rtsai sarti asrti srati rsati arsti rasti tarsi atrsi trasi rtasi artsi ratsi stira tsira sitra istra tisra itsra stria tsria srtia rstia trsia rtsia sirta isrta srita rsita irsta rista tirsa itrsa trisa rtisa irtsa ritsa sairt asirt siart isart aisrt iasrt sarit asrit srait rsait arsit rasit sirat israt sriat rsiat irsat risat airst iarst arist raist irast riast tairs atirs tiars itars aitrs iatrs taris atris trais rtais artis ratis tiras itras trias rtias irtas ritas airts iarts arits raits irats riats
Note: these 'words' (valid or invalid) are all the permutations of the word stair. These words are obtained by scrambling the letters in stair.