code: def get_known_facts(x=None):
      """
      Facts between unary predicates.
  
      Parameters
      ==========
  
      x : Symbol, optional
          Placeholder symbol for unary facts. Default is ``Symbol('x')``.
  
      Returns
      =======
  
      fact : Known facts in conjugated normal form.
  
      """
      if x is None:
          x = Symbol("x")
  
      fact = And(get_number_facts(x), get_matrix_facts(x))
      return fact
  
file_path: sympy/sympy/assumptions/facts.py
imports: from sympy.assumptions.ask import Q
  from sympy.assumptions.assume import AppliedPredicate
  from sympy.core.cache import cacheit
  from sympy.core.symbol import Symbol
  from sympy.logic.boolalg import to_cnf, And, Not, Implies, Equivalent, Exclusive
  from sympy.logic.inference import satisfiable
label_desc: Use image node_id 2 for calling a global function with example usage: get_known_facts(x) and returns: fact