CONECT    1    2    6    7
CONECT    2    1    3    8
CONECT    3    2    4    9
CONECT    4    3    5   10
CONECT    5    4    6   11
CONECT    6    1    5   12
CONECT    7    1   13
CONECT    8    2
CONECT    9    3
CONECT   10    4
CONECT   11    5
CONECT   12    6
CONECT   13    7
