An objection of lack of unity should consist of logically presented, technical reasoning containing the basic considerations behind the finding of lack of unity. When necessary, this comprises the considerations relating to the number and grouping of the claimed separate inventions. In particular, the reasons should highlight the technical problem(s) addressed by the different inventions, unless it is perfectly clear from the remainder of the argumentation that the different inventions could not possibly be subsumed under an overall problem. For each invention or group of inventions the reasons should also specify the special technical features making a contribution over the art or the common general inventive concept, as appropriate. When the objection is based on a document, the relevant passages are appropriately identified.