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From Wikipedia:
A tuple is of the form $T=(D,R,h)$ where $D$ is the domain, $R$ is a set of relation names, and $h$ is a mapping that associates a column name to each relation in $R$. To represent a tuple, we can see $D$ as the set of keys, and $R$ the table associated with those set of keys, and $h$ the column names of the table.
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