I understand that you combine an interface (which puts function names and parameter/return types in scope) and a deployed contract address which actually implements these functions. My question is, why do all the addresses used with AggregatorV3Interface have multiple contracts stored at them? First of all, I thought that a single address can only contain one contract. Yet when I look at the etherscan for the 1INCH/USD price feed, I see multiple contracts. How can this be? Second, how do I know which contract the interface is implementing when there are multiple contracts? Thanks.

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actually only one main contract AggregatorProxy which implement AggregatorV3Interface in link you post, others are just libs linked or contracts inherited/imported

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