This one began as a simple loop of six pentagons that was turned inside-out using two loops of three pentagons. Afterwards to link those inside-out loops (which look perhaps like a toothy mouth) another loop was used--the original simple loop of six pentagons was elaborated with interlacing hexagon spacers (these loops inner hole look like the outlines of eights with a vertical javelin through it). Below, I included a wallpaper version of the pattern.