class ColourChanger:
    def __init__(self):
        self.colour_replacement = {'red': 'black', 'green': 'white'}

    def make_lowercase_list(self, list):
        i=0
        for element in list:
            list[i] = element.lower()
            i+=1
        return list

    def contains_all(self, list1, list2):
        containsAll = True
        for element in list1:
            if element not in list2:
                return False
        return True

    def make_readable(self, colours):
        result = []
        colours = self.make_lowercase_list(colours)

        if self.contains_all(self.colour_replacement.keys(), colours):
            for col in colours:
                if col in self.colour_replacement:
                    result.append(self.colour_replacement[col])
                else:
                    result.append(col)
            return result
        return colours


c = ColourChanger()
print(c.make_readable(['red', 'green', 'white', 'pink', 'yellow', 'red']))
print(c.make_readable(['red', 'Green']))
print(c.make_readable(['red', 'red', 'yellow', 'Red']))