This bead is at Row 5. Column 1 stopped at Row 4, one row above → blue (≠).
- Column 4 goes down to Row 5, so use Rule 2: look 3 columns back, at Column 1.
- Column 1 stopped at Row 4, one row above → blue (≠).
Common table reading watchout: Thinking "no bead at this row" means blue. It is blue only when Column 1 stopped exactly one row above this bead.