What I propose was to be used with your inheritance method. The else part
should also be changed to
```
# the number of non-zero elements is smaller than the subregion
smat = {}
for rk, ck in self._smat:
if rlo <= rk <= rhi and clo <= ck <= chi:
smat[(rk-rlo, ck-clo)] = self._smat[(rk, ck)]
return self._new(r, c, smat)
```
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