<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _compute_deletions(self):
 """If there are fewer than self._proc_limit possible deletion sets, compute all subprocessors obtained by deleting a minimal subset of qubits. """

        M, N, L, edgelist = self.M, self.N, self.L, self._edgelist
        if 2**len(self._evil) <= self._proc_limit:
            deletions = self._compute_all_deletions()
            self._processors = [self._subprocessor(d) for d in deletions]
        else:
            self._processors = None