why hand picking is necessary after winnowing?
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ʜᴀɴᴅ-ᴘɪᴄᴋɪɴɢ ɪs ɴᴇᴄᴇssᴀʀʏ ᴀғᴛᴇʀ ᴡɪɴɴᴏᴡɪɴɢ ʙᴇᴄᴀᴜsᴇ sᴏᴍᴇ ʜᴇᴀᴠɪᴇʀ sᴜʙsᴛᴀɴᴄᴇs ʟɪᴋᴇ sᴛᴏɴᴇ ᴏʀ ᴏᴛʜᴇʀ ᴜɴᴡᴀɴᴛᴇᴅ ᴍᴀᴛᴇʀɪᴀʟs ᴍᴀʏ ᴀʟsᴏ ғᴀʟʟ ᴡɪᴛʜ ᴛʜᴇ ɢʀᴀɪɴs. sᴏ ɪɴ ᴏʀᴅᴇʀ ᴛᴏ ʀᴇᴍᴏᴠᴇ ᴛʜᴇsᴇ, ʜᴀɴᴅᴘɪᴄᴋɪɴɢ ɪs ᴅᴏɴᴇ.
ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs ᴜʜ✌
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Hand Picking is necessary after winnowing because through winnowing, the wind blows away the lighter chaff while the heavier and slightly larger sized impurities fall back down and mix with the grain. ... In such situations, the hand picking is a convenient method of separating above mentioned impurities.
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