How can I speed up iterating through a nested for-loop?

Question

I have an ndarray data set data with the following data: [\'1 2 3\' \'2 3 4\' \'3 4 5\' \'4 5 6\' \'1 3 5\' \'2 4 6\' \'1 3 4\' \'2 4 5\' \'3 5 6\' \'1 2 4\' \'2 3 5\'