mixing D-76

I've always used the premixed chemicals in the school lab and am now mixing darkroom chemicals for the first time. I'm frustrated and confused by the lack of information on the packaging. I have Kodak developer D-76 and the package says "to make 1 u.s. gallon". On the backside of the package, there is notation regarding "dilution 1:1". Does this mean that I should mix the chemicals to make a 1 gallon stock solution that is then diluted 1:1 before use ? If not, do I mix my chemicals to be a 1/2 gallon stock solution and then dilute 1:1 before use ?

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