<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def arch_prefixes(self):
 For arch1/arch2/arch3, this returns [arch1],[arch1/arch2],[arch1/arch2/arch3] """


        archs = self.archs(as_list=True)
        prefixes = []

        for i in range(1, len(archs)+1):
            prefixes.append(archs[:i])

        return prefixes