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Comments in green were written by me. Comments in blue were not written by me.
There seems to be an issue with the text formatting of 18, if you click hide this puzzle and re-open 18 the text loses it formatting and becomes:
The expansion of \((x+y+z)^3\) is
$$x^3 + y^3 + z^3 + 3x^2y + 3x^2z + 3xy^2 + 3y^2z + 3xz^2 + 3yz^2 + 6xyz.$$
Until you refresh the page
alex
on /blog/86
               
@alex: Well spotted. I'll attempt to fix it...
Matthew
on /blog/86
               

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