How to hide Task list for a custom role

Summary:

We are creating a custom role where we have a requirement to not show a few links in Purchase Order Task lists (like Requisitions, Agreements, Deliverables, Supply Base, Administration). We can hide these items in task list properties. We would like to know how do we hide these task links for a custom role? These links should not appear for only custom role. What is the EL expression to use and where do we use it?

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