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several cartesian products

Hi,

I want to construct, given $m$ and $q$, the list of all vectors $v=(a_1,\dots,a_m)$ such that $0\leq a_1\leq \dots \leq a_m < q$. I tried to use "CartesianProducts" but I don't known how to iterate it $m$-times.

Thanks.-.

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