       |
|                                                                               |
|  s(q)/t  =  (Sum_k d_k . 2^(m-k)) / 2^m  =  (Sum_k d^k.A(q) . 2^(m-k)) / 2^m  |
|                                                                               |
o-------------------------------------------------------------------------------o

Applied to the example of fourth gear curves, this scheme results in the data
of Tables 17-a and 17-b, which exhibit one period for each orbit.  The states
in each orbit are 