1. The problem statement, all variables and given/known data First of all, Happy New Year! I have to solve the following exercise (xmas gift :P) and some things are a bit vague..Here is it: For the ee--->ee scattering process, draw all amputated and connected graphs that would contribute. The hint is that one should find 10 different contributions. 2. Relevant equations QED Feynman rules and graph amputation rules, check S-matrix and LSZ Reduction Formula. 3. The attempt at a solution My first move was to go for a rigorous computation but as you can imagine it didnt work out. Then I tried ti be more practical and drew as many contributions for one loop correction to te process i could. Finally I ended up with four, as I cant go blind with it, I mean I have to step on a solid basis (ie formula) to start to draw more. The four diagramms I drew can be seen in the following image. How can I find seven more of them?? I suppose using brute force is not the deal and I'm very confused. Thank you in advance for your help. Happy New year!