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9 letter words:

riroriros9,

8 letter words:

riroriro8,

5 letter words:

orris5,

4 letter words:

iris4, roos4, siri4, sori4,

3 letter words:

ios3, iso3, oor3, oos3, ors3, roo3, sir3, sri3,

2 letter words:

io2, is2, oi2, oo2, or2, os2, si2, so2,