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census taker. Example
someone who collects census data by visiting individual homes
a mechanism for stepping through the values in an object
an object that iterates through its associated collection
Keywords:
Immutable,
Traversing,
Explicitly,
Element,
Interface
an immutable list that need not store its elements explicitly but knows, from a set of basic data, how to determine the i -th element and the position of a given object
an interface that provides access to a series of elements and fits a specific pattern
an interface that provides methods for traversing a list of elements
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