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