serai esrai sreai rseai ersai resai seari esari saeri aseri easri aesri sraei rsaei sarei asrei rasei arsei erasi reasi earsi aersi raesi aresi seria esria sreia rseia ersia resia seira esira siera isera eisra iesra sriea rsiea sirea isrea risea irsea erisa reisa eirsa iersa riesa iresa seair esair saeir aseir easir aesir seiar esiar siear isear eisar iesar saier asier siaer isaer aiser iaser eaisr aeisr eiasr ieasr aiesr iaesr sraie rsaie sarie asrie rasie arsie sriae rsiae sirae israe risae irsae saire asire siare isare aisre iasre raise arise riase irase airse iarse erais reais earis aeris raeis areis erias reias eiras ieras rieas ireas eairs aeirs eiars iears aiers iaers raies aries riaes iraes aires iares
Note: these 'words' (valid or invalid) are all the permutations of the word serai. These words are obtained by scrambling the letters in serai.