Μετά από ψάξιμο, βγήκε λίγο καλύτερα, στις 26 και μάλλον εδώ σταματάμε:
[2, 9, 13, 15]
[1, 4, 7, 12]
[4, 7, 12, 14]
[1, 3, 10, 14]
[1, 5, 9, 12]
[2, 9, 11, 14]
[2, 8, 10, 12]
[3, 5, 8, 10]
[5, 8, 10, 14]
[1, 3, 6, 13]
[1, 3, 8, 15]
[1, 5, 9, 13]
[2, 7, 11, 15]
[2, 5, 7, 13]
[1, 3, 6, 13]
[2, 4, 8, 13]
[1, 8, 13, 15]
[3, 7, 10, 15]
[3, 6, 12, 14]
[2, 4, 7, 12]
[2, 8, 13, 15]
[3, 5, 8, 14]
[3, 9, 12, 14]
[2, 8, 10, 12]
[1, 6, 8, 11]
[3, 9, 13, 15]