Column 7 has 2 beads. Column 4 has 4 beads. Different depth → blue (≠).
- Column 8 starts, so use Rule 1: compare Column 7 with Column 4, 3 columns further back.
- Column 7 has 2 beads. Column 4 has 4 beads. Different depth → blue (≠).
Common table reading watchout: Comparing the wrong columns. Compare Column 7, the one that just finished, with Column 4.