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Shimming Succeeding EBar Packs

Since we wouldn't want to erase everything, the leapfrog has to be halted. That is done by inserting a shim between one series of EBar sextets and the next, consisting of an E5 and an E2 running alongside of each other. Actually the shim is thicker, but these two gliders convert into the EBar and an E1 which lead the pack initiating a new predicate cycle.

**Figure 21:** The leapfrog can be stopped by an (E5, E2) pair, which becomes an (EBar, E1) pair. But the same configuration must also stop the C3-C1 pair sequence which filters EBars, as shown in the left drawing. There it is triggered by one particular A triplet, rather than an A trimer.
$\begin{figure}\centering\begin{picture}(400,380) \put(0,10){\epsfxsize =180pt \e... ...\put(220,0){\epsfxsize =180pt \epsffile{stopwhit.eps}} \end{picture}\end{figure}$

Harold V. McIntosh 2002-07-11