There are some duos who simply look attractive together and complement each other's features, both in their similarities and distinct differences. This type of combination gives the feeling of complementing and completing each other. Understanding this from a Kitchener thought process, I have created a metric to determine if a couple matches these parameters.

AB + ACD​

The key elements are this 1. one individual has two lines while the other has three; 2. the duo share one line; 3. the individual with three lines has a line that is doing a similar thing to the other person's second line; 4. the individual's third line adds some variety.

When these elements are combined it creates a duo pleasing to the eye who bring out each other's features - both similar and different.