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5 letter words:

orbit7,

4 letter words:

biro6, bort6, brio6, brit6, obit6, riot4, roti4, tiro4, tori4, trio4,

3 letter words:

bio5, bit5, bot5, bro5, obi5, orb5, rib5, rob5, ort3, rot3, tor3,

2 letter words:

bi4, bo4, it2, oi2, or2, ti2, to2,