whirs hwirs wihrs iwhrs hiwrs ihwrs whris hwris wrhis rwhis hrwis rhwis wirhs iwrhs wrihs rwihs irwhs riwhs hirws ihrws hriws rhiws irhws rihws whisr hwisr wihsr iwhsr hiwsr ihwsr whsir hwsir wshir swhir hswir shwir wishr iwshr wsihr swihr iswhr siwhr hiswr ihswr hsiwr shiwr ishwr sihwr whrsi hwrsi wrhsi rwhsi hrwsi rhwsi whsri hwsri wshri swhri hswri shwri wrshi rwshi wsrhi swrhi rswhi srwhi hrswi rhswi hsrwi shrwi rshwi srhwi wirsh iwrsh wrish rwish irwsh riwsh wisrh iwsrh wsirh swirh iswrh siwrh wrsih rwsih wsrih swrih rswih srwih irswh riswh isrwh sirwh rsiwh sriwh hirsw ihrsw hrisw rhisw irhsw rihsw hisrw ihsrw hsirw shirw ishrw sihrw hrsiw rhsiw hsriw shriw rshiw srhiw irshw rishw isrhw sirhw rsihw srihw
Note: these 'words' (valid or invalid) are all the permutations of the word whirs. These words are obtained by scrambling the letters in whirs.