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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder solution with back program\") OR (\"variance optimization python python programming\"))~".
• Removing quotes may allow a broader search: (( coder solution with back program ) OR ( variance optimization python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder solution with back program") OR ("variance optimization python python programming"))*.