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// Last line of an item starts with a :  and may specify a figure file.
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Please solve the problem.
: 
{
   
   Study the problem in the left panel and enter your answer(s).
   : 
   
   Click on the <it>Submit Answer</it> button.
   : 

   Carefully read any feedback provided in the right panel. Scroll if necessary.
   :

   Finally, click on <it>Next Problem</it> button to start over.
   :
}