Find ideal of Grassmannian in Macaulay 2

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This question is a technical question about M2. I know that in Macaulay 2 I can use "Grassmannian$(l,k)$" to get ideal of $(l+1)$-plane in $\mathbb{C}^{k+1}$ and the result ideal is in $\mathbb{ZZ}[p_I]$, but how can I work in another field, say, $\mathbb{ZZ}/32003$?