I can’t see how the codes are executed in each lesson. Apparently I should be able to?
I’m using firefox.
Did you execute the cell with Shift + Enter or the “Run” icon in the toolbar?
Normally an executed cell will get a number of the left side between the []. Here, there is none, so it seems that you did not execute the cell.
ah cool, the keywords worked. The ‘Run’ button didn’t! Thanks a lot. 
Oh this is weird. You can continue to use the shortcut. It is going to be faster
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