The nodes are adjacent in sum2, and sum2 executes more instructions than sum1, and sum2 is faster than sum1.
The nodes are adjacent in sum3, and sum3 executes more instructions than sum1, and sum3 is faster than sum1.
The nodes are adjacent in sum2, and sum2 executes more instructions than sum1, and sum2 is faster than sum1.
The nodes are adjacent in sum3, and sum3 executes more instructions than sum1, and sum3 is faster than sum1.