Could not find function "glimpse" and "arrange"

I am a beginner and follow the instruction, but two functions I was writing came up with errors. I checked the spelling, re-read the instruction. Even with the solution one, I tried to run the chunk, but came up with an error. Other functions, such as "str" or "colnames" works fine. I don't understand why those functions won't work.

You need to load the appropriate package before running those function:

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