bonds labels completed?
append the information of node2 to node1 and empty node2
assign node1 and node2
swap Node
closeRingCount = 0
initialize
node1 == node 2 ?
node1 = path[7].toNodenode2 = path[8].toNode
YES
bond1 = bond668（bond of node which labeled 668）bond2 = bond446（bond of node which labeled 446）path = {}
begin
If four bonds labels of node are completed.
NO
closeRingCount
end
path.length = 8 ?
closeRingCount++
find the right path
