Thank you for the anwer
I appreciate your help and will check the functionality you suggest!
The thing that I needed to know is the retweets of (almost) ALL tweets a user Ux posted, not just any tweet… Then to see how many retweets the user Uy did over the Ux tweets… It takes so long if I use GET statuses/retweeters/ids…
But after thinking a little today, what I am going to do is find (almost) all the tweets of user Uy and then see if in the of each Uy’s tweet I can find the user Ux as the original author… Well I hope I can go on with my research 