<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def postParse(self, original, loc, tokens):
 """Create a ComputationNode for Combine."""

        return ComputationNode(self._combine, original, loc, tokens, ignore_no_tokens=True, ignore_one_token=True)