The FSI guidelines are shared a lot, but they are really bad because they are hardly applicable to anyone that is not an US diplomat.
Check https://www.cambridge.org/elt/blog/wp-content/uploads/2018/1..., it will give you a way better picture.
Check https://www.cambridge.org/elt/blog/wp-content/uploads/2018/1..., it will give you a way better picture.
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