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