This bead is at Row 2. Column 4 stopped at Row 1, one row above → blue (≠).
- Column 5 goes down to Row 2, so use Rule 2: look 1 column back, at Column 4.
- Column 4 stopped at Row 1, one row above → blue (≠).
Common table reading watchout: Thinking "no bead at this row" means blue. It is blue only when Column 4 stopped exactly one row above this bead.