A Smartdown Stack can have its cards in separate files, or they have their content within a single file, called a multicard document.
To author such a document, precede each logical card by a header identifying the card's key, which may then be used for hyperlinking within the multicard document.
For example, the Card2 in this example multicard stack has its content preceded by the following syntax:
# Card2
---What is your name? Hello
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Hello
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