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parallel approval process with multiple related users

We want a parallel approval process.And the approver will be selected on record. It can be multiple or single for different records. For example
we have three fields (user lookup) to select user as approver.
Now for one record user can select 2 approver and for second record user can select 3 approvers. 
Based on number of approver selected the approval process must take approval from those only.