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P£¨i, j+1£©=P(i,j)+[-a*P(i,j)-b*P(i,j)^3+k*(P(i+1,j)+P(i-1,j)-2*P(i,j)]
P(0,j)=[4P(1,j)-P(2,j)]/[3+L]
P(N,j)=[4P(N-1,j)-P(N-2,j)]/[3+L]

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