<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def combine(self, other, name=None):
 """Combine with another PhaseGroup and return the result."""

    return PhaseGroup(
        setup=self.setup + other.setup,
        main=self.main + other.main,
        teardown=self.teardown + other.teardown,
        name=name)