Access-to-variable designates constant when trying to pass a pointer to vector element

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Angular project - Azure DevOps - 3 Environment files. In the yaml file, where do I put the variable that designates which environment file to use?

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Which component designates the entry point of an activity?

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ggplot: In geom_tile, how to use a variable designates the groups instead of the individual id's on x and y axis

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