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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 replace_all(text, replace_dict):
 """ Replace multiple strings in a text. .. note:: Replacements are made successively, without any warranty on the order \ in which they are made. :param text: Text to replace in. :param replace_dict: Dictionary mapping strings to replace with their \ substitution. :returns: Text after replacements. 'oof rab oof thing' """

    for i, j in replace_dict.items():
        text = text.replace(i, j)
    return text