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firstly
01
прежде всего
used to introduce the first fact, reason, step, etc.
Пример
When setting up your profile, firstly, enter your basic information such as name and email address.
In presenting your argument, firstly, outline the main reasons supporting your position.
Firstly, gather all the necessary materials before starting the experiment.
In planning your day, firstly, prioritize the most important tasks to ensure they get done.
Firstly, describe the setting of the story.