30.1. An inmate whose parole has been terminated must complete the portion of the term of imprisonment that remained to be served at the time parole was granted, less(a) any remission time credited at the time parole was granted;
(b) any time spent on parole;
(c) any time spent in custody by reason of the suspension of the inmate’s parole; and
(d) any remission time for the period spent in custody by reason of such suspension.