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4 letter words:

cobs8, cose6, ecos6, obes6, seco6,

3 letter words:

cob7, bes5, bos5, cos5, eco5, obe5, obs5, sec5, sob5, soc5, oes3, ose3,

2 letter words:

be4, bo4, ob4, es2, oe2, os2, so2,