  Just as before, the classical physical theory underlying the dynamics of these chaotic systems is one in which probability does not feature. So we are able to give an adequate characterisation of the physical situation without appeal to any probabilities fit to play the chance role. Given well-enough behaved boundary conditions, this system is also deterministic (though see  §5.3),  and that may also be thought to preclude a role for non-trivial chances. So again we have randomness in the performance, though none of the outcomes happened by chance.