GD Crossword Puzzle

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Across
  1. 3. the application of typical elements of game playing
  2. 7. the state of being full of life or vigor; liveliness
Down
  1. 1. the use of diagrams in calculation and design
  2. 2. Defining software solutions to one or more sets of problems
  3. 4. the branch of applied mathematics dealing with motion
  4. 5. Human Computer Interaction
  5. 6. a period of time