I thought that there was a rule saying that you could only operate in one defined orientation, which means that you couldn't flip over and keep on driving (you had to right yourselves up somehow before moving?)
I just checked the rules and I couldn't find what I read before that got me to think about not being able to invert and keep on driving, but I distinctively remember reading a rule and deciding as a team that we wouldn't make something like that... but how did it do? Crab drive... wow awesome! But... Crab drive X 2? Even more epic!
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For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast. -- Ephesians 2:8-9
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