Using "complete_old" without loading with data() prevents referring to the object in the environment

[murraycadzow]

There becomes a difficulty in talking about the dataset complete_old in the ggplot and exploring data episodes as it doesn't appear in the environment tab so we can't reinforce referencing the environment tab and that you can do the same operations View() and str() by interacting with that panel

Perhaps we use data(complete_old) at the start of the ggplot episode so that it appears in the environment tab and can be referred to visually