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Consider the multivariable polynomial $$g(x,y,z,w)=a_1xyw+a_2xy^2+a_3xyz+a_4x^3z+a_5z^3+a_6y^2z+a_7w^4\;,$$ where $a_1,\cdots, a_7$ are constants. I would like to use Maple to extract the coefficients of all the terms of total degree 3 in the above expression. As a first step, I sorted the terms of the polynomial by total degree, using $>\mbox{sort}(g, '\mbox{tdeg}');$ but then I have no idea how to use coeff to collect the coefficients of interest. Any help is welcome!

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