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