Baker's dozen is a period-12 oscillator consisting of a loaf hassled by two blocks and two caterers. The original form (using period-4 and period-6 oscillators to hassle) was found by Robert Wainwright in August 1989.
It can be stabilised and welded in many ways. A caterer can be used in 2 ways, one way is also suitable for the jam. A mazing would work, and two can be stabilised next to each other. Two opposite ones can be stabilised with two bookends (shown below as bookend on snake).
- 39P12.1 at Heinrich Koenig's Game of Life Object Catalogs