Practice chaining exceptions to preserve error context in a multi-step data processing script. Each step may throw its own custom exception if it fails. You must chain exceptions so that if a later step fails, the original exception(s) are not lost, and the full context is available when catching the error.

• Call processStepOne, processStepTwo, and processStepThree in order, passing the output of one as the input to the next.
• If processStepOne throws an exception, throw a new generic Exception with message "Processing failed at step one" and chain the original exception.
• If processStepTwo throws an exception, throw a new generic Exception with message "Processing failed at step two" and chain the original exception.
• If processStepThree throws an exception, throw a new generic Exception with message "Processing failed at step three" and chain the original exception.
• If all steps succeed, return the final result.