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9 letter words:

infixions19,

8 letter words:

infixion18,

6 letter words:

inions6,

5 letter words:

infix15, finis8, finos8, foins8, infos8, inion5,

4 letter words:

fino7, fins7, foin7, fons7, info7, inns4, ions4, nisi4,

3 letter words:

fix13, fox13, nix10, six10, sox10, xis10, fin6, fon6, ifs6, inn3, ins3, ion3, nos3, ons3, sin3, son3,

2 letter words:

ox9, xi9, if5, of5, in2, is2, no2, oi2, on2, os2, si2, so2,