Across:
   1. Great ______!
   2. To crouch down in fear.
   3. To state one's opinion.
   4. French for "I thought".
   5. E stands for the number of these in Euler's famous formula: V - E + F = 2.

Down:
   1. Informal word for a telescope or microscope.
   2. Past tense of a word meaning to deal with something difficult.
   3. Yet to be paid.
   4. The opposite of relaxed.
   5. Undirected graphs in which any two vertices are connected by exactly one path.

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