Column 5 has 2 beads. Column 4 has 1 bead. Different depth → blue (≠).
- Column 6 starts, so use Rule 1: compare Column 5 with Column 4, 1 column further back.
- Column 5 has 2 beads. Column 4 has 1 bead. Different depth → blue (≠).
Common table reading watchout: Comparing the wrong columns. Compare Column 5, the one that just finished, with Column 4.