A bi-block puffer is any puffer whose output is bi-blocks. The term is particularly used for p8 c/2 puffers, in which case a bi-block fuse is created. A bi-block puffer is easily made using two backrakes whose gliders impact symmetrically. Jason Summers welded two backrakes to form a more compact puffer, as shown below.
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By periodically burning the bi-block fuse using perturbations by a following backrake and spaceships, c/2 rakes can be created for all periods that are a multiple of eight.