code: def clear_color(self, adj_entry, color):
      if adj_entry.col_prev is None:
          self.adj_color[color] = adj_entry.col_next
      else:
          adj_entry.col_prev.col_next = adj_entry.col_next
      if adj_entry.col_next is not None:
          adj_entry.col_next.col_prev = adj_entry.col_prev
  
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 4 for calling the _Node obj's underlying member method code with example usage: obj.clear_color(adj_entry, color) without return types