class_docstr: Create a disjunct node. In order for this node to be true, all of its
  children must evaluate to false
class_docstr_tok: ["Create","a","disjunct","node",".","In","order","for","this","node","to","be","true",",","all","of","its","children","must","evaluate","to","false"]
code: def to_string(self, with_parens=None):
      with_parens = self._should_use_paren(with_parens)
      ret = super().to_string(with_parens=False)
      if with_parens:
          return "(-" + ret + ")"
      else:
          return "-" + ret
  
label_desc: Use image node_id 1 for calling the DisjunctNode obj's underlying member method code with example usage: obj.to_string(with_parens) and returns: unknown, unknown