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: 2011 - 5 Coin Year Set - Choice Brilliant Uncirculated - In Snap-Lock Protective Holder
Product feature: Terrific gift item for just about any gift giving occasion!, Coins are all in Choice Brilliant Uncirculated condition!, Coins are housed in a protective snap-lock holder to persevere their value and beauty!, Dates on the coins will always be a reminder of that very special time!, Great item when used in an award on incentive program!
Target attributes: Mint Mark
Answer: attribute: mint mark
value: None
source: None