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In addition to the Standard of Perfection, The Plymouth Rock Standard and Breed Book is a must have, and is available for free download at https://archive.org/details/plymouthrockstan00amerrich
This. Read and re-read.
If I remember my statistics and permutations stuff from a lifetime ago in university, TF has two different males and two distinctly different females. This gives her Four distinctive breeding pens. If she hatches 24 chicks from each of the Four matings, does a good job with punching and record keeping, it would be fascinating to look at the outcome come late September.