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4 letter words:

mobs8, bros6, mors6, orbs6, robs6, roms6, sorb6,

3 letter words:

mob7, bos5, bro5, mor5, mos5, oms5, orb5, rob5, rom5, sob5, som5, ors3,

2 letter words:

bo4, mo4, om4, or2, os2, so2,