Multiple

class Camera {}
class MobilePhone {}
class CameraPhone is Camera is MobilePhone {}

say CameraPhone.^mro;     # undefined type object
say CameraPhone.new.^mro; # instantiated object

Output:

CameraPhone() Camera() MobilePhone() Any() Mu()
CameraPhone() Camera() MobilePhone() Any() Mu()

The .^mro is not an ordinary method call, but a call to the object's metaobject that returns the method resolution order for this type.