You appear to have some misconceptions about this issue. Redeeming in lawful money has nothing to do with communicating permission to use Federal Reserve notes as an elastic currency. Notes are not money they are a promise to pay money, that is why they are also called bills. Money is coin. To redeem a note is to be paid the promised amount of money i.e. coin by the promissor. The promissor in this case is the US Treasury but they long ago defaulted on their legal obligation to pay their bills on demand. You cannot actually redeem your notes in lawful money because the promissor is bankrupt and has no money in its vaults.
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