Generation 91 of bunnies 9, 104 of bunnies 10, 106 of bunnies 10a, 112 of bunnies 10b and 146 of bunnies 11 (excluding an escaped glider) all consist of the generation 13 of bunnies and a hexaplet spark that dies off after another six generations.
Generation 13 of bunnies
Generation 91 of bunnies 9, 106 of 10a
Generation 104 of bunnies 10
Generation 146 of bunnies 11
Another draft
In 1973, Everett Boyer et al. proposed a classification scheme for two-glider collisions at right angles.^{[1]} By considering the delay and parity of separation, a two-glider collision is labelled with a number and a plus/minus sign. For instance, in the collision that gives a bi-block, the paths of two gliders are separated by an odd number of cells (the effect can be seen clearly under LifeHistory), and two gliders arrive simultaneously to the intersection point of two paths — therefore it is labelled "0-". Delaying any of the two gliders gives a "1-" reaction that synthesizes a B-heptomino. The results are tabulated below.