<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def hidden_from(self, a, b):
 """Return True if ``a`` is hidden in a different box than ``b``."""

        return a in self.hidden_indices and not self.in_same_box(a, b)