def freqAt(freqDict: dict, nuc: str, n: int) -> float:
  """Read a frequency dictionnary returned 
    by the function freqList.

    **Keyword arguments:**  
    freqDic -- frequence dictionnary  
    nuc -- nucleotide A,T,G or C  
    n -- position
  """

  return freqDict[nuc][n]