Before revision:  In terms of code design, we show the effectiveness of hybrid codes that combine replication and erasure coding , and also discover fundamental connections between multi-set batch codes and the problem of maximizing the service rate region.
After revision:  In terms of code design, we show the effectiveness of hybrid codes that combine replication and erasure coding in terms of code design. We also discover fundamental connections between multi-set batch codes and the problem of maximizing the service rate region.