“S, B, K,” Tiegan says. “Strong, brave, and kind. It’s kind of our motto now, mom says. And we say it to each other all the time.” “Hello and goodbye are meaningless,” Della says, pulling Tiegan close to her again. “SBK is a constant reminder, every time we greet each other, every time we say goodbye, it’s a reminder of how to live. It’s so much more than a greeting.”