custom calculation bracketing overlap

Hello,
Can we write a formula to calculate the average of the areas of the calibrating standards framing the tests in overlap bracketing mode. I would like for example average(area1;area2) and average (area2;area3)
std1 cal : area1
lot1
lot2
std1 cal : area2
lot3
lot4
std1 cal : area3
thank you for your help

syb

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