Design pattern - Roles and SubRoles (Suggestions)

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The problem statement is having 3 roles (A,B,C) and unlimited sub-roles for each role i.e.

• For role A: I have n sub roles
• For role B: I have m sub roles
• For role C: I have k sub roles
• Permissions means allowing GET, POST, PUT and DELETE on various resources.
• Every subrole may or maynot have same permissions.

Appreciate any suggestions on how to implement it using node_acl?