class_docstr: Calculate the Munkres solution to the classical assignment problem.
  See the module documentation for usage.
docstr: Erase all prime markings
docstr_tok: ["Erase","all","prime","markings"]
code: def __erase_primes(self):
      """Erase all prime markings"""
      for i in range(self.n):
          for j in range(self.n):
              if self.marked[i][j] == 2:
                  self.marked[i][j] = 0
  
imports: import sys
label_desc: Use image node_id 20 for calling the Munkres obj's underlying member method code with example usage: obj.__erase_primes() without return types