This bead is at Row 4. Column 4 stopped at Row 3, one row above → blue (≠).
- Column 7 goes down to Row 4, so use Rule 2: look 3 columns back, at Column 4.
- Column 4 stopped at Row 3, 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.