The first column: 15+6+ 1=22, the second example: 36+ 18-2=52, the third column: 48+ 18 (axis of symmetry), and the fourth column: 20+20+. Symmetry axis (48+48) addition and subtraction! Therefore, = 7 * 2 (14) 7 * 5 (35) (47) =143547.