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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 rows(self, offs):
        '''
        Iterate over raw indx, bytes tuples from a given offset.
        '''
        lkey = s_common.int64en(offs)
        for lkey, byts in self.slab.scanByRange(lkey, db=self.db):
            indx = s_common.int64un(lkey)
            yield indx, byts