In the description you must: 
Specify the technical field to which the invention relates. You may do this for example by reproducing the first ("prior art") portion of the independent claims in full or in substance or by simply referring to it. 
Indicate the background art of which you are aware, to the extent that it is useful for understanding the invention, preferably citing source documents reflecting such art. This applies in particular to the background art corresponding to the prior art portion of the independent claims. Source document citations must be sufficiently complete to be verifiable: patent specifications by country and number; books by author, title, publisher, edition, place and year of publication and page numbers; periodicals by title, year, issue and page numbers. 
Disclose the invention as claimed. 
The disclosure must indicate the technical problem that the invention is designed to solve (even if it does not state it expressly) and describe the solution. 
To elucidate the nature of the solution according to the independent claims you can repeat or refer to the characterising portion of the independent claims or reproduce the substance of the features of the solution according to the relevant claims. 
At this point in the description you need only give details of embodiments of the invention according to the dependent claims if you do not do so when describing ways of performing the claimed invention or describing what the drawings show. 
You should state any advantageous effects your invention has compared with the prior art, but without making disparaging remarks about any specific previous product or process. 
Briefly describe what is illustrated in any drawings, making sure you give their numbers. 
Describe in detail at least one way of carrying out the claimed invention, typically using examples and referring to any drawings and the reference signs used in them. 
Indicate how the invention is susceptible of industrial application within the meaning of Article 57.
In exceptional cases you may arrange the description in a different manner and order if this affords a better understanding or a more economic presentation. 
Although the description must be clear and straightforward and avoid unnecessary technical jargon, the use of recognised terms of art is acceptable and often desirable. Little known or specially formulated technical terms may be allowed provided that they are adequately defined and that there are no generally recognised equivalents. 
You may use proper names or similar words to refer to a product only if they uniquely identify it. Even then, however, the product must be sufficiently identified, without reliance upon such terms, to enable the invention to be carried out by the skilled person. If such proper names or similar words are registered trade marks, that fact should be mentioned. 

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