With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: A core standard valve layout based on the action of three valves had become almost universal by (at latest) 1864 as witnessed by Arban's method published in that year. The effect of a particular combination of valves may be seen in the table below. This table is correct for the core three-valve layout on almost any modern valved brass instrument. The most common four-valve layout is a superset of the well-established three-valve layout and is noted in the table, despite the exposition of four-valve and also five-valve systems (the latter used on the tuba) being deficient in this article.
text_B: Would a reader of this article expect to find more information about the five-valve system in a subsequent issue?
YES.