art; (e) briefly describe the figures in the drawings, if any; (f) set forth at least the best mode contemplated by the applicant for carrying out the invention which shall be done in terms of examples where appropriate, with reference to drawings, if any; and (g) indicate explicitly, when it is not obvious from the description or nature of the invention, the way in which the invention is industrially applicable and the way in which it can be made and used, or, if it can only be used, the way in which it can be used. (2) The manner and order of presentation of the description specified in this regulation shall be followed except where, because of the nature of the invention, a different manner or a different order would result in a better understanding and a more concise presentation of the description. 19. Claims. (1) The claim shall define the matter for which protection is sought in terms of the technical features of the invention. (2) The numbers of the claims shall be reasonable, taking into account the nature of the invention, and, where there are several claims, they shall be numbered consecutively in Arabic numerals. (3) Whenever appropriate, the claim shall contain— (a) a statement indicating the technical features of the invention which are necessary for the definition of the claim but which, in combination, are part of the prior art; and (b) a characterising position preceded by the words “characterised in that” “characterised by” or “in which the improvement comprises” or any other words to the same effect stating concisely the technical features which, in combination with the features stated under paragraph (a) of this subregulation it is desired to protect. (4) A claim shall not, except where absolutely necessary, rely with regard to the technical features of the invention, on references to the description or drawings and, in particular, it shall not rely on such references as— “described in part ________ of the description”, or “as illustrated