It seems you only learn by rote instruction. How many years did it take you to graduate? I have explained this numerous times. In the three point referance of A, B, C; A and C or B and C or A and B may be at relative rest to each other. In which case the two point calculation is the same as a three point calculation. That is the case in every example I am aware of where data such as cosmic muons or particles from accelerators etc., have been generated and/or calculated. But these are special cases and even the correct gamma does not salvage SRT because in the correct three point view you cannot then reverse who is at rest to create the non-existant reciprocity advocated by SRT. So SRT is only 50% right under very limited conditions where two of the three pointa are at relative rest. Think you got it now? Or will I need to repeat it many more times?