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Please let me know the steps to delete a permission set from 3500 users

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You have to delete junction object of permision set - PermissionSetAssignment.

Set<Id> userIds = new Set<Id>();
/** fill ths set Ids of users you want delete permission set **/
yourPermissionSetId = [SELECT Id FROM PermissionSet WHERE Name = /** your Permission Set Name**/ LIMIT 1].Id;

delete [SELECT Id 
        FROM PermissionSetAssignment 
        WHERE AssigneeId IN : userIds AND PermissionSetId = : yourPermissionSetId];
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