How to add more than one approver for a task without building hierarchy

Summary:

Users want the approval notification to be sent out to two approvers at once. They will approve/reject or ignore depending on whether the contract comes under their work or not.

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Users want to route contracts update notification to two users at once. They don't want a parent child relationship between the users. They want the notification to be sent out at the SAME TIME. How to configure the approval rule/task configuration so that this requirement is fulfilled?

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