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5 letter words:

firks12, frisk12,

4 letter words:

firk11, fisk11, kifs11, irks8, kirs8, kris8, risk8, firs7, fris7, rifs7,

3 letter words:

kif10, irk7, kir7, kis7, sik7, ski7, fir6, ifs6, rif6, sif6, sir3, sri3,

2 letter words:

ki6, if5, is2, si2,