In each diffusion phase a radius-5 toggle rule is inverse iterated 32 times. Each inverse iteration requires initialization with 10 bits. These come in left-to-right order from the link. The entire 320 bits of the link are thus consumed in each diffusion phase. After each diffusion phase the bits in the link region, i.e. on the right for left-diffusion phases and on the left for right-diffusion phases, are ``folded back" into the encryption process by using them as the link for the next subround (see figures 5 and 8). Note that an alternative would be to randomly generate a new link for each subround. While possibly desirable from the point of view of data security, this would lead to a high data-expansion rate. Link encryption is meant to simulate the production of new random bits for each diffusion phase.