Column 4 has 3 beads. Column 2 has 2 beads. Different depth → blue (≠).
- Column 5 starts, so use Rule 1: compare Column 4 with Column 2, 2 columns further back.
- Column 4 has 3 beads. Column 2 has 2 beads. Different depth → blue (≠).
Common table reading watchout: Comparing the wrong columns. Compare Column 4, the one that just finished, with Column 2.