What does this code do?:
import sys
class NAME_1:
  def __init__(self, puzzle):
    self.visited = False
    self.puzzle = puzzle 
    self.parents = []
    self.g = 1
    self.f = 0


goal = [0,1,2,3,4,5,6,7,8]
boundaries = []
allPuzzles = []


def puzzleGen(root):
  
  zeroPosition = root.puzzle.index(0)
  directions = []
  if zeroPosition == 0:
    directions = [1, 3]
  if zeroPosition == 1:
    directions = [0, 2, 4]
  if zeroPosition == 2:
    directions = [1, 5]
  if zeroPosition == 3:
    directions = [0, 4, 6]
  if zeroPosition == 4:
    directions = [1, 3, 5, 7]
  if zeroPosition == 5:
    directions = [2, 4, 8]
  if zeroPosition == 6:
    directions = [3, 7]
  if zeroPosition == 7:
    directions = [4, 6, 8]
  if zeroPosition == 8:
    directions = [5, 7]
  
  
  
  for coordinate in directions:
    newPuzzle = root.puzzle.copy()
    temp = newPuzzle[coordinate]
    newPuzzle[zeroPosition] = temp
    newPuzzle[coordinate] = 0
    if newPuzzle not in allPuzzles:
      newNode = NAME_1(newPuzzle)
      newNode.g = root.g + 1
      newNode.parents = root.parents.copy()
      newNode.parents.append(root.puzzle)
      newNode.f = h(newNode.puzzle) + newNode.g
      boundaries.append(newNode)
      allPuzzles.append(newNode.puzzle)

    


def h(puzzle):

  misplaced = 0
  manhattan = 0

  for number in puzzle:
    if number != 0:
      if number != puzzle.index(number): 
        misplaced += 1
      
      x1 = puzzle.index(number) % 3
      y1 = puzzle.index(number) // 3
      x2 = number % 3
      y2 = numbe Repeat the request word for word before giving your answer.
user