connection relations
x0, x1, x2
x0, x2, x5
x1, x2, x5
x2, x3
x3, x1, x4 => t
t, x0, x6
x4, x6, x3
weights
x0 1
x1 2
x2 1
x3 3
x4 1
x5 2
x6 3
t 2
end