whoops, let's try this again. . . .
f(y,z) = n(y3 + z3) + a; For y = 0, and positive y; For x, 0 to h
f(y,z) = n(-y3 - z3) - a; For negative y; For x, -h to 0
f(y,z) = n(y3 - z3) - a; For negative y; For x, -h to 0
f(y,z) = n(-y3 + z3) + a; For y = 0, and positive y; For x, 0 to h
f(y,z)...