a href="../../built-on-ethereum/erc-token-standards/erc20/" title="ERC20" class="md-nav__link">
      ERC20
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      ERC621
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  <li class="md-nav__item">
    <a href="../../built-on-ethereum/erc-token-standards/erc721/" title="ERC721" class="md-nav__link">
     