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