node1,node2,node3,node4,node5,node6,node7,node8  attr1,attr2=val2
node1,node2,node3,node4                          attr3,attr4=val4
node5,node6,node7,node8                          attr5,attr6=val6
node1,node3,node5,node7                          attr7,attr8=val8
node2,node4,node6,node8                          attr9,attr10=val10
