last update july 2022: there are two basic loops here arising with (22.16.6) for the 288 identical terms, while (22.16.11) for the other 432 identical terms such loops depicted in fig.2, fig.3 respectively
https://drive.google.com/file/d/1QHrsnrxS0HaDwVaG-ArOH8uNiWwId9pO/view
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i can say (with full confidence) that more than 60% of my acquired knowledge in QFT i learned from the late Prof. Pierre van Baal especially on qft perturbative calculations see pp. 51 - 56
https://library.oapen.org/viewer/web/viewer.html?file=/bitstream/handle/20.500.12657/50887/9781466594609.pdf?sequence=11&isAllowed=y
