The Map
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A map is an abstract data type holding unordered associations between key-value pairs, each key appearing exactly once — also called a dictionary, terms bound to definitions.
Show
A station code looks up its station name; the code is the key, the name the value.
Watch for
One key, one appearance — that rule is load-bearing.