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if you don't have a collection of seeds you're ngmi
at the bare fucking minimum, even those bags of mixed beans meant for soup are better than nothing, and with the variety of beans, you get a variety of nutrients; just keep the beans in a cool dark place & you'll be fine
and if you're worried about bugs, put them in an airtight jar / vacuum packed bag with a few bay leaves mixed inside (bay leaves will kill the bugs, its an actual legit thing, seriously, look it up)
most seeds, if kept in favorable conditions, can easily last 10 to 30 years