pratice question on collections from K&B mock exam book

Hi
Can some please clarify me what below question is asking?

Part two of Question 6a:
Write a class that creates a collection in which a given instance of Items
can be retrieved using a different associated String called "buyer".

Regards,
Don..

You should show little more energy to copy-paste entire question,i didn't find it sufficient.

The question is asking you to make a class which defines some collection (which collection is to be used, I am leaving to you), such that an object of Items class is mapped to different String IDs, the variable identifier of which is 'buyer'.

thanks Pritish, I thought "buyer" is associated with identifier string not the name of Collection(map