St. Petersburg Chain Stitch, How-ToC33U
String on a tension bead (for which I've used a light green size 8). String 2 olive beads, 1 berry bead, and 2 olive beads.
Pass through all 4 of the olive beads again, skipping the berry bead altogether. This creates a square of beads with a little picot at one end.
String 4 olive beads (A); pass through the first 2 beads just strung, making sure this little square of beads is snug to the other beadwork (B).
String 1 berry bead; pass back through the last 2 olive beads just exited, plus one more (A); pull tight (B).
String 1 berry bead; pass through the third and fourth olive beads added in Step 3, then pull tight.