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Step 1: Understand the definition of a 2D list and its elements
A 2D list is a list of lists, where each element can be a list itself. In other words, it is a table-like data structure with rows and columns. An element in a 2D list refers to the individual items contained within the nested lists.
Step 2: Examine the 2D list structure
Here, the 2D list $L$ has three elements, each being a sub-list: $[1, 2, 3]$, $[4, 5, 6]$, and $[7, 8, 9]$.
Consider a 2D list like this: L = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
Final Answer
In this example, the elements of the 2D list $L$ are the sub-lists $[1, 2, 3]$, $[4, 5, 6]$, and $[7, 8, 9]$, which consist of individual integers.
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