3.2.2 Plurality of independent claims in different categories 

A plurality of independent claims in different categories (see F‑IV, 3.1) may constitute a group of inventions so linked as to form a single general inventive concept as defined in Rule 44(2).

However, it is essential that a single general inventive concept link the claims in the various categories. The presence in each claim of expressions such as "specially adapted" or "specifically designed" does not necessarily imply that a single general inventive concept is present.