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PBS next looks through your preferences within the bid group step by step. If a Prefer Off preference is encountered, PBS will look through each of the dates left to right and attempt to honor each one. In the case of a day of the week, PBS will look at each date. For example, Prefer Off Saturday would be processed as Prefer Off December 1, 8, 15, 22, 29. If the Prefer Off preference has an Else Start Next Bid Group and PBS is unable to honor one of the dates within that preference, PBS will jump to the next bid group. If the preference has no Else Start Next and PBS is unable to honor a date, it will simply ignore the date and continue to the right to attempt to honor any other dates or move to the next preference as applicable. If the Prefer Off preference has an All or Nothing clause and PBS is unable to honor one of the dates, it will ignore all of the dates in the preference and move to the next preference, but stay within the bid group.
Absent any all or nothing or else start next with your PREFER OFF PBS will try and partially award dates. This might filter out some of your trip specific bids.