We note that, although, in [Z], Chen uses a slightly different model for the G-module, his module is readily seen to be isomorphic to ours. Translated into our setting, Chen proves the following:

Thus, in order to prove Theorem 1.1, it will suffice to establish that there are no further G-orbits in than those listed in Table 1, and that is . We shall however give a fully self-contained proof of Theorem 1.1.
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