Give an example of NP$-$complete $($NPC$)$ language that models some meaningful and$/$or interesting problem in the real world. You may do some $($online$)$ research to come up with the language. Originality is the key. The NPC language you give must be uncommon, not any of that one can easily find on the internet. You must provide the complete and precise definition of the language as we did for all the examples given in class. Describe the background and terminology you use if necessary. Discuss the significance of the language in terms of the practical implications of a fast algorithm that decides it$.$