def _countOverlapIndices(self, i, j):
if i in self.bucketMap and j in self.bucketMap:<EOL><INDENT>iRep = self.bucketMap[i]<EOL>jRep = self.bucketMap[j]<EOL>return self._countOverlap(iRep, jRep)<EOL><DEDENT>else:<EOL><INDENT>raise ValueError("<STR_LIT>")<EOL><DEDENT>
Return the overlap between bucket indices i and j