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Does anyone know if Simply Potatoes hash browns are GF?

They contain potatoes, dextrose disodium, dihydrogen pyrophoshate,
potassium sorbate, and sodium bisulite.  They sound GF to me but I do
not want to chance them since they are not on my list of approved foods.
If anyone knows if all these ingredients are GF please let me know.
Thanks, Robin in Phoenix