Stacks
A stack is a type of data structure. Imagine it as a stack of plates. When we take a plate, we take the plate at the top.
When we add a plate, we add it to the top.
First in, first out.
Stacks have 2 operations.
.append(x) - Appends the item to the top of the stack
.pop() - Takes the item on the top of the stack
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