fires ifres fries rfies irfes rifes fiers ifers feirs efirs iefrs eifrs freis rfeis feris efris refis erfis irefs riefs ierfs eirfs reifs erifs firse ifrse frise rfise irfse rifse fisre ifsre fsire sfire isfre sifre frsie rfsie fsrie sfrie rsfie srfie irsfe risfe isrfe sirfe rsife srife fiesr ifesr feisr efisr iefsr eifsr fiser ifser fsier sfier isfer sifer fesir efsir fseir sfeir esfir sefir iesfr eisfr isefr siefr esifr seifr fresi rfesi fersi efrsi refsi erfsi frsei rfsei fsrei sfrei rsfei srfei fesri efsri fseri sferi esfri sefri resfi ersfi rsefi srefi esrfi serfi iresf riesf iersf eirsf reisf erisf irsef risef isref siref rsief srief iesrf eisrf iserf sierf esirf seirf resif ersif rseif sreif esrif serif
Note: these 'words' (valid or invalid) are all the permutations of the word fires. These words are obtained by scrambling the letters in fires.