The description of the letter shown above refers to the semi-block format.
We can arrive at this answer because:
It is important to point out that this letter format requires that the first line, of all paragraphs, has an indentation. This indentation must be half an inch from the left margin, which is equivalent to 5 spaces.
All elements such as bullet points, topics, numbering, among others, must be aligned with this indentation.
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