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Soak the skewers in water for 30 minutes. In shallow glass or plastic dish or resealable food-storage plastic bag, mix onion, garlic, parsley, paprika, pepper flakes, cumin, salt, 2 tablespoons of the olive oil and lemon juice. Add chicken; turning to coat with marinade. Cover dish or seal bag; refrigerate, turning chicken occasionally, at least 1 hour to marinate.