Urgent Help with IUPAC

How many elements of unsaturation are implied by the molecular formula C8H10ClNO? Draw Three structure, one containing ether and amine group, one containing amide group, one containing amine and ketone group.

I have no clue where to begin and read the chapter. as long as it is understandable. I will be very thankful...

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Sorry, we can't do that. It's against forum rules. Please see the second line of my signature.
Well, technically I tried everything I could. Can you just state some clues on how to approach that problem? I will appreciate it... Specially the first question, I did answer the second question... thanks alot...
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