Suppose you're asked to debug a piece of R code that uses global variables and is exhibiting unexpected behavior. What are some strategies you could use to identify the problem?

Some strategies to identify problems in R code that uses global variables and exhibits unexpected behavior include reviewing the code for potential conflicts or unintended modifications to the global variables, using print statements or debugging tools to inspect the values of the global variables at different points in the code to identify inconsistencies or unexpected changes, and temporarily removing or resetting the global variables to isolate their impact on the code and determine if they are causing the unexpected behavior.