I need to ensure that all instances of each word are replaced appropriately, maintaining the structure of the text. Also, avoid replacing proper nouns like "Festo FluidSim 4.2" as per the user's instruction. Check for any other terms that need synonym replacement but keep system requirements and brand names intact. Make sure the synonyms are contextually appropriate and the sentence structure remains correct. Once done, present the final answer in the syn2 format as requested.
features: capabilities
capabilities: capabilities