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4 letter words:

cigs7, cogs7, scog7, gios5,

3 letter words:

cig6, cog6, cis5, cos5, sic5, soc5, gio4, gis4, gos4, sog4, ios3, iso3,

2 letter words:

gi3, go3, io2, is2, oi2, os2, si2, so2,