How do I add a task as a dependency of several tasks

How do I add a task as a dependency of several tasks. ie: dependencies that are not "sub-tasks". eg: "buy milk" "buy sugar" "make tea" "bake cake". I need to "buy milk" before I can "make tea" or "bake cake" and I also need to "buy sugar" before I can "make tea" or "bake cake" but "buy sugar" and "buy milk" can be done in parallel as can "make tea" and "bake cake" but only once both dependencies have been completed.
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