### diffuse4

#### diffuse4 patch-variable number

Like diffuse, but only diffuses to the four neighboring patches (to the north, south, east, and west), not to the diagonal neighbors.

    diffuse4 chemical 0.5
    ;; each patch diffuses 50% of its variable
    ;; chemical to its neighboring 4 patches. Thus,
    ;; each patch gets 1/4 of 50% of the chemical
    ;; from each neighboring patch.)

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