How to eliminate same person approval

Summary

How to eliminate same person approval

Content

we have defined multiple rules based on the approval triggers same person two or three times.

If same person appears in rules (approval tree) and it should eliminate second time. 

Do we have any setup in BPM to eliminate approval second time to the person.

Example: Approver A appears three times and it should trigger approval only once if rules building multiple times.  I don't want to change the rules but eliminate after workflow.

Approver A

Approver B

Approver X

Approver A

Approver Y

Approver A

Thanks,

Anil