The second instruction mentions a "just created data frame". This seems to me misleading, maybe better changing it to something like: "the dataframe created in the code box below" or rephrasing the entire set of instructions to point at the dataframes to concatenate more explicitly.
The second instruction mentions a "just created data frame". This seems to me misleading, maybe better changing it to something like: "the dataframe created in the code box below" or rephrasing the entire set of instructions to point at the dataframes to concatenate more explicitly.