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Pulumi can be utilized to monitor changes to the AWS API Gateway and automatically redeploy it in the event of a removed method by using the following steps:

1. Write a Pulumi program that defines the desired state of the API Gateway (including its methods), and creates it using the AWS API Gateway resources, such as aws.apigateway.RestApi and aws.apigateway.Method, with pulumi.export to export the API Gateway's URL.

2. Configure a monitor to watch for changes to the API Gateway's resources. This can be done using Pulumi's built-in monitoring feature or a separate monitoring tool.

3. When a change is detected, the monitor can notify the Pulumi program to update the API Gateway accordingly. If a method is removed, the program can use the aws.apigateway.Method resource's delete method to remove the corresponding method from the API Gateway.

4. After the update, the Pulumi program can again export the API Gateway's URL for external use.

5. The program can also be integrated with continuous integration and deployment systems to automatically test and deploy changes to the API Gateway without manual intervention.

By utilizing Pulumi in this way, AWS API Gateway deployments can be easily automated and kept in sync with desired state, resulting in reduced errors and faster response times.