How to use “look up in pairs” block?

How to use “look up in pairs” block?

App Inventor 2 has a look up in pairs block but you dont know how to use it? Here,there is litle example

We can use “look up in pairs” blocks like map.Map is a tag/value based method for storing information.

There is two big block.They do same.One of use select list > index in list and the other one use look up in pairs.

Its just simple example,i hope you understand how its work

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