Example in STE:
Make sure that the EMER pushbutton switch is released (the EMER legend is off).
(This sentence has 10 words, because the text in parentheses counts as one word. The sentence in parentheses has 5 words and count as a different sentence.)
If there is an identifier in parentheses (a number, a letter, or an alphanumeric identifier), this identifier counts as one word in the sentence. Abbreviations in parentheses also count as one word.
Examples in STE:
Remove the safety pin (10). (5 words)
Installation of a Business Class (B/C) Seat (7 words)
Hardware and Software Configuration Check of the In-Flight Entertainment (IFE) System (11 words)
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