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"will make it easier to refer to the variables when printing them"

 

When who is printing them?

the browser?

 

and p 14

 

"To display the value of a variable, you can print the variable without quotation marks:"

 

Meaning, I can ask the browser to print the variable? 

Or, I can type the variable (key) the variable w/o quotation marks?

 

and then 

 

what do you mean by "you can print the variable without quotation marks"

I mean- 

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