def cmoment(X, n, condition=None, **kwargs):
    mu = expectation(X, condition, **kwargs)
    return moment(X, n, mu, condition, **kwargs)
GC content for only the 20mer, as per the Doench paper/code
dataset/ETHPy150Open sympy/sympy/sympy/stats/rv_interface.py/cmoment--crossover with--dataset/ETHPy150Open MicrosoftResearch/Azimuth/azimuth/features/featurization.py/countGC