Resolve Contradictions By Keeping Functions

Someone will say: "Wow, this bike has an ideal chain that does not exist!" And TRIZ-expert would, probably, build a contradiction: "The chain should exist to transmit force from driver to wheel, AND should not exist to simplify transmission and reduce the cost. So, the chain exists only virtually in the form of its function and it does not really exist by delegating the function to the new simplified transmission"