This function returns a list of the coefficients of a symmetric divisor on M0,n in the standard basis.
i1 : D=symmetricDivisorM0nbar(6,2*B_2+3*B_3)
o1 = SymmetricDivisorM0nbar{2 => 2 }
3 => 3
NumberOfPoints => 6
o1 : SymmetricDivisorM0nbar
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i2 : coefficientList(D)
o2 = {2, 3}
o2 : List
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