Index Confusion?

[qcc4cp]

Hi

First of all, thanks for providing this implementation. Supremely helpful!!!

I wonder about file:
5qubit-qPCA.ipynb

Line 252:
"\left|a_j\right\rangle \left| b_i \right\rangle \left|a_i\right\rangle \left| b_j \right\rangle\n",

I believe there is an index confusion and the line should read:
"\left|a_j\right\rangle \left| b_j \right\rangle \left|a_i\right\rangle \left| b_i \right\rangle\n",