In this task, you will be shown a sentence, and you should determine whether it is overruling or non-overruling. In law, an overruling sentence is a statement that nullifies a previous case decision as a precedent by a constitutionally valid statute or a decision by the same or higher ranking court which establishes a different rule on the point of law involved. Classify your answers into overruling or non-overruling
Q: second, there are material differences between the parole act and parole code. for example, as petitioner himself pointed out in his pro se petition, the parole code vests the board with discretion, in certain situations, to award a convicted parole violator with credit for time spent at liberty on parole.
A: 
non-overruling