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Historically, herring has been one of the major protein sources in Sweden, however the elite considered herring to be lower class food and consumed the herring mainly in its pickled form, staring in the mid-18th century.<unk> Of course, a more complex version of the sentence is "Historically, herring has been one of the major protein sources in Sweden, however the elite considered herring to be lower class food and consumed the herring mainly in its pickled form, staring in the mid-18th century".