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: Genuine Intel Core 2 Quad CPU Computer Processor SLB6B 2.66GHZ 1333MHZ 6M Q9400
Product description: Specifications, Brand : Intel, Processor_Type : Core 2 Quad, Type : CPU Computer Processor, MPN : SLB6B, Clock_Speed : 2.66GHZ, Bus_Speed : 1333MHZ, L2_Cache : 6M, Number_of_Cores :, Socket_Type :, Other_Info : Q9400, Short_Description : Genuine Intel Core 2 Quad CPU Computer Processor SLB6B 2.66GHZ 1333MHZ 6M Q9400, Note : Buyer will receive any of the compatible part numbers or manufacturers listed above which will work with your current computer.
Product brand: Intel
Target attributes: Number of Cores
Answer: attribute: number of cores
value: core 2 quad
source: product title
attribute: number of cores
value: core 2 quad
source: product description