Question: How to implicitplot/contourplot f(x,y,z) on R2 in specific range?

Hi, I am very new in maple and I am learning the command plot/contourplot. Given, for example f(x,y,z) = x*y*z defined on x=0..1, y=0..1, z=0..1; I want 1. to implicitplot3d the function f for f(x,y,z)= 1, 1/2, 1/4, 1/8, 1/16, 1/32, ..., 1/2^10 2. to see the previous graphics only when (x>y ∧ y>z) 3. to CONTOURPLOT each "level" of f(x,y,z) obtained in 2 on the plane (x,y),(x,z) and (y,z). Thanks a lot in advance, Jacques.
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