def findIndex_TensorFactorList(tfl):
freeIndex = set()
dummyIndex = set()
tooMany = set()
other = set()
for factor in tfl:
for ind in factor['indexList']:
if not tensor.isAllowedDummyIndex(ind):
other.add(ind)
elif ind in dummyIndex:
tooMany.add(ind)
elif ind in freeIndex:
freeIndex.remove(ind)
dummyIndex.add(ind)
else:
freeIndex.add(ind)
return {'free':freeIndex,
'dummy':dummyIndex,
'tooMany':tooMany,
'other':other}
