explanation

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• Add conversion factors or quantities using the respective "+" buttons
• Edit by clicking on the edit icon that appears when you hover over the right side of the card
• Separate units using parentheses or multiplication symbols "*"
• Editing is done with MathQuill -- works much like on Desmos graphing calculator
• To "flip" a card (reciprocal), shift-click on the edit icon
• Perform a calculation by moving cards to the calculate box then clicking the "+" button in that box.
• All cards in the calculate box will be multiplied together, with appropriate unit cancellation.
• The result card will be in gray to indicate it is not editable