If Denial Mode has removed all deniable bid preferences without producing a complete block, the N-PBS Scheduler tries to create  a block using only the Award bid preferences. If the N-PBS Scheduler still can’t create a block, it makes a final attempt using only the system-generated  Award Pairings bid preference. This final attempt, called Secondary Line Generation (SLG), ignores all preferences and performs an exhaustive search to find you a complete block. If you don’t have any deniable bid preferences, Denial Mode goes directly to the final completion attempt and attempts  to find you a complete block using SLG.