Oplossing raadsel ‘gebroken flessen’.

6 – 0 + 4 + 6 + 8 + 2 – 9 – 7 – 7 + 6 + 1 – 7 + 3 – 6 + 0 – 7 + 8 – 6 + 8 – 6 + 8 + 7 – 9 + 1 = 4