Salesman / Salesmen

Quick question:

In section 165 in the (FIRST Edition) Simplified FM manual I don't understand why they write "salesmen" using the men-blend but farther down they spell "salesman" out (not using a man-blend). In section #167 (of the SECOND Edition) it appears that the sound man would be a blend, too. Is there a simple explanation?

See link to example:

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