node[1-8] attr1=valA
node[1-4] attr2=valB
node[5-8] attr2=valC
node[1-2] attr3=valD
node[3-4] attr3=valE
node[5-6] attr3=valF
node[7-8] 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
