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