Inspecting dataframes

There are several functions you can use to inspect your dataframe. To name a few

head: this by default prints the first 6 rows of the dataframe
tail: this by default prints the last 6 rows to the console
str: this prints the structure of your dataframe
dim: this by default prints the dimensions, that is, the number of rows and columns of your dataframe
colnames: this prints the names of the columns of your dataframe

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