code: def _find_usage_ACLs(self):
          
          # Network ACLs per VPC
          acls = defaultdict(int)
          for acl in self.conn.describe_network_acls()['NetworkAcls']:
              acls[acl['VpcId']] += 1
              # Rules per network ACL
              self.limits['Rules per network ACL']._add_current_usage(
                  len(acl['Entries']),
                  aws_type='AWS::EC2::NetworkAcl',
                  resource_id=acl['NetworkAclId']
              )
          for vpc_id in acls:
              self.limits['Network ACLs per VPC']._add_current_usage(
                  acls[vpc_id],
                  aws_type='AWS::EC2::VPC',
                  resource_id=vpc_id,
              )
docs: find usage for ACLs