[Subroutine] For the remainder of this run, the Runner must pay 1 [Credit] as an additional cost each time he or she uses an icebreaker to break at least 1 subroutine. [Subroutine] For the remainder of this run, the Runner must pay 1 [Credit] as an additional cost each time he or she uses an icebreaker to break at least 1 subroutine.