title: Subscripts in R when adding other text
body: <p>How would you add a subscript to one particular word of a title in R? For example, suppose the title is <code>"A_2 and B_2."</code> How would you add these two subscripts? I know that <code>expression("A"[2])</code> and <code>expression("B"[2])</code> individually add subscripts to these letters.</p>