Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Emerson Ceiling Fans CF4801AB Premium Select Indoor Ceiling Fan, Blades Sold Separately, Light Kit Adaptable, Antique Brass Finish
Product description: Emerson CF4801AB Premium Select Indoor Ceiling Fan, 44-72" Blade Span, Antique Brass, Blades Sold Separately
Product feature: 52-Inch, 58-Inch or 70-Inch blade span, 50 hand carved wood, weather-resistant resin and plywood blade options for true customization (blades sold separate), Light fixture adaptable, Accent lighting with patented swivel sockets uses three 25-watt candelabra bulbs (included), Control adaptable
Product brand: Emerson
Target attributes: Number of Blades
Answer: attribute: number of blades
value: None
source: None