If transactions are "confirmed" and added to the blockchain through the process of mining blocks that contain those transactions, how can a transaction get more than one confirmation, or be mined twice, to reach the recommended 6 confirmations? Are the additional confirmations a count of the subsequent blocks built atop the block that provided the original confirmation? Would it be fair to say that a transaction's first confirmation, the mining of the block that includes it, is a slightly different type of confirmation than the subsequent 5?