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Heather Brooks-Hill's avatar

Brilliant David! Thanks! Can you think of more creative solutions to our global dilemma?

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Joseph Graham's avatar

David, that problem was resolved and explained in this .pdf file. It is a good idea to pay special attention to the notes at the end, though

https://www.ballyhoo.ca/uploads/2/2/6/9/22695826/__intercitynavigationforearth.pdf

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