Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Blanco Closeout 508-811 16 x 11 Self Rimming Bar Sink in Stainless S
Product description: Blanco Closeout 508-811 16 x 11 Self Rimming Bar Sink in Stainless Steel
Product feature: Model: 508-811, Stainless Steel Plate Stack - Wave Plus Small Bowl, 15-3/4" x 10-7/16"
Product price: $143.24
Product brand: Blanco
Target attributes: Number of Bowls
Answer: attribute: number of bowls
value: None
source: None