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5 letter words:

ziffs20,

4 letter words:

ziff19, zoos13, fifi10, offs10, oofs7,

3 letter words:

fiz15, zoo12, zos12, iff9, off9, ifs6, oof6, sif6, ios3, iso3, oos3,

2 letter words:

zo11, if5, of5, io2, is2, oi2, oo2, os2, si2, so2,