/**
 * @param routesAndLocations A String specification of the 
 * routes between locations. A comma-separated list
 * of roads and paths between locations defined as 
 * [startLocation][type][endLocation] e.g.
 *
 * "a-b" represents two locations, where travel is only possible 
 *   from a to b on foot 
 * "a-b,b-a" represents two locations, where travel 
 *   is possible in both directions on foot
 * "a=b,b=c,c=a" represents a triangular one-way road travelling 
 *   from a, through b and c, and finally back to a.
 *
 * Routes can be of two types:
 * - Paths (accessible on foot only)
 * = Roads (accessible on foot & by car)  
 */
class CityMap(routesAndLocations: String) {

  /**
   * Determine whether a journey from the startLocation to the
   * destinationLocation can be made, based on the available routes
   * and whether on foot (onFoot=true), or by car (onFoot=false)
   */
  def isJourneyPossible(startLocation: String, destinationLocation: String, onFoot: Boolean): Boolean = ???

}