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Write a function "division" such that division(f,F) returns the quotient(s) and remainder of a polynomial f divided by an ordered tuple F of polynomials, where all polynomials live in a ring with an arbitrary number of variables.

Since you don't know a priori the number of elements in F, one option is to pass F to your function as a list. You can get the length of the list with #F and you can access its entries with F_0, F_1, etc. Similarly, you can return the quotients in a list {q1,q2,...,qs}. There is a section on lists in the M2 documentation under The Macaulay2 Language -> lists and sequences.