Individual C1 collisions do not enter into the Cyclic Tag System, but they are still interesting for the possibilities they may afford for alternative tag systems, as well as for the reasons they may not have been favored in the system actually realized.
Given that the C gliders and the EBar all have odd width, any collision must result in an even overall result. It may consist exclusively of even gliders, such as A's and B's, sometimes even G's, and those may be produced in any quantity.
When there are odd gliders, they must arise in pairs, and may actually consist of the original pair after having changed places. Those are the solitonic collisions, giving hope that similar encounters may be repeated and that one member may end up at the far end of a long chain consisting of instances of the other member.
It is not excluded that the collision of a single odd pair could produce an odd quadruple, but neither that nor any otber amplification has been seen in practice.
Figure 5 displays the four C1-EBar collisions, Two are solitonic, giving hope that they could participate in a tag system. The other two produce only even gliders, the A pentamer collision showing interest because of its interaction with oncoming EBar's or F's, principally in stopping them and converting them into C1's or C2's.
In the actual Cyclic Tag System a similar role is played by tetramers gratuitously arriving from the far west. The tetramers are also more selective, allowing some EBars to pass, while stopping others.
The remaining collision produces an assortment of A's and B's. Although they could have their uses, dealing with both at the same time complicates the situation.
