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40 Inventive Principles
Universality

If the object can perform several different functions, there is no need for other objects or elements, which can be removed.
 

EXAMPLE:
  1. The handle of a briefcase also serves as a chest expander.
  2. A printer that can also be used as a scanner, copier and fax machine.
  3. 2-in-1 shampoos fulfil the functions of two components: shampoo and conditioner.