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sono off with switched relay

Good evening, i write from italy and now I expose you my problem:
In my electrical system I have a switched relay where are connected 3 
buttons and 20 lamps, the first click and the second click of the button 
turn on 10 lamps at a time, the third click of the button turns them all 
on 20 together and the fourth click of the button turns them all off.
This operation occurs from any button connected to the relay.
What sonoff should I install and how should I connect it to have the 
same type of ignitions and also be able to control it with alexa?
Thank's

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