simple addition

• 8 + 6 = 14
• 8 + 7 = 15
• 8 + 9 = 17
• 7 + 6 = 13
• 7 + 8 = 15
• 7 + 9 = 16
• 6 + 7 = 13
• 6 + 8 = 14
• 6 + 9 = 15
• 9 + 6 = 15
• 9 + 7 = 16
• 9 + 8 = 17