7 )( 5 )- 5 12 3 July 8, 2019 16 32 64 128 7 5 * 12 35 7 5 12 3 4 7 5 12 36 7 5 12 30 7 5 12 3 8 5 12 7 9x 10 5 12 3x 5 12 7 9y 10 5 12 3y 7 4 x 5 3 12 5 7 12 5 5 3 spine