: Col 1: ▲ (up) → ▲ (right) → ▲ (down) Col 2: ▲ (right) → ▲ (down) → ▲ (left) → Col 3: ▲ (down) → ▲ (left) → ▲ (up) = missing cell. C. Addition / Subtraction of elements Two cells combine to form the third (overlay). Often XOR (exclusive or): overlapping lines cancel, non-overlapping remain.

: shading (white, gray, black), shape (circle, square, triangle), size (small, medium, large), orientation.

: Row 1: ▢ → ▢▢ → ▢▢▢ (adds 1 square per column) Row 2: ▢▢ → ▢▢▢ → ▢▢▢▢ → Missing in Row 3, Col 3 = 5 squares. B. Rotation / Reflection Shapes rotate (45°, 90°, 180°) or flip horizontally/vertically across the matrix.