Common Activity Between Actors

Hello everyones,
I am working on the Operational Analysis and I have a problem.
My actors share multiplied operational activities.
Is there a way to show that some operational activitiy are commun between actor ?
I want to provide my futur diagram to be unreadable and redundant objects.

To illustrate my problem:

Thanks for help!

I tried with this solution, but maybe it can cause logical problem for next diagram :