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Draw a map of an underground of a city (with horizontally and vertically lines from center to center of the fields). Note:

  • At the center of a field, the lines may turn or branch.
  • The whole map is connected.
  • There are no dead ends.
  • The underground cannot leave the grid.
  • The numbers at the borders give the corresponding numbers in that row or column. The pieces may be rotated.
  • Fields may stay empty.