code: def __init__(self, node_id):
      self.node_id = node_id
      self.next = None
      self.mate = None
      self.col_next = None
      self.col_prev = None
  
imports: import itertools
  from collections import defaultdict, deque
  import networkx
  from networkx.utils import arbitrary_element, py_random_state
label_desc: Use image node_id 1 to create a new _AdjEntry object  with example: obj = _AdjEntry(node_id)