Question: 3d contourplot (3 variables not 3d view of contourplot with two variables)

When we have a two variable function f(x,y), Maple can plot f-inverse of a value with contourplot. But how about contourplot of a three variable function? for example f-1(0) which can be a surface in the 3 dimensional space. The contourplot3d is just the contourplot (2-dimensional) which also shows the value of f(x,y) on the third axis. So this is not what I want.

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