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5 letter words:

fidos9, foids9,

4 letter words:

difs8, fido8, fids8, foid8,

3 letter words:

dif7, dof7, fid7, ifs6, sif6, dis4, dos4, dso4, ids4, ods4, sod4, ios3, iso3,

2 letter words:

if5, of5, di3, do3, id3, od3, io2, is2, oi2, os2, si2, so2,