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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def all_descriptions():
 """ Generates a list of descriptions of all the models :return: """

    para = []
    para += build_parameter_descriptions(models.Soil()) + [",,\n"]
    para += build_parameter_descriptions(models.SoilProfile()) + [",,\n"]
    para += build_parameter_descriptions(models.Foundation()) + [",,\n"]
    para += build_parameter_descriptions(models.PadFoundation()) + [",,\n"]
    para += build_parameter_descriptions(models.SDOFBuilding()) + [",,\n"]
    para += build_parameter_descriptions(models.FrameBuilding2D(1, 1))

    return para