node1,node2,node3,node4,node5,node6,node7,node8 attr1=valA
node1,node2,node3,node4 attr2=valB
node5,node6,node7,node8 attr2=valC
node1,node2 attr3=valD
node3,node4 attr3=valE
node5,node6 attr3=valF
node7,node8 attr3=valG
node1 attr4=valH
node2 attr4=valI
node3 attr4=valJ
node4 attr4=valK
node5 attr4=valL
node6 attr4=valM
node7 attr4=valN
node8 attr4=valO
