ffrith fifths firish firsth firsts firths fissi- fittit frisii friths fritts hi-fis hififi histi- histri ifitis ifrits ihitit iris-t iritis irtish isists isthis itfits itthis ittiri rfhrhs rififi rishis rititi shifts shihhi shirif shirrs shirts shirtt shishi shists shshsh shtshi siiiii siriri sirris sirsir sirtir sirtis sirtsi sisisi sisith sistri sithir sshift sssfrs sthiti stiffs stirit stiths striff strift striif thirst thisis thithi thitsi thrift thriis thrist thtshr tiff-f tirrit tishri titiri trists trshts tshirt