code: def calculate_rates(base_currency, counter_currency, forward_rate=None, fwd_points=None, spot_reference=None):
      
      if base_currency not in DIVISOR_TABLE:
          divisor = DIVISOR_TABLE.get(counter_currency, DEFAULT_DIVISOR)
          if forward_rate is None and fwd_points is not None and spot_reference is not None:
              forward_rate = spot_reference + fwd_points / divisor
          elif forward_rate is not None and fwd_points is None and spot_reference is not None:
              fwd_points = (forward_rate - spot_reference) * divisor
          elif forward_rate is not None and fwd_points is not None and spot_reference is None:
              spot_reference = forward_rate - fwd_points / divisor
  
      rates = {}
      if forward_rate is not None:
          rates['forward_rate'] = forward_rate
  
      if fwd_points is not None:
          rates['fwd_points'] = fwd_points
  
      if spot_reference is not None:
          rates['spot_reference'] = spot_reference
  
      return rates
docs: Calculate rates for Fx Forward based on others.