GenerateLTA

Add N emputy nodes in linklist

i = L

i 3

head

Complete loop configuration of each node in layer i

i++

YES

Begin

Add bonds labels of each node in layer i

Initialise(head)

End

Exchange nodes

Close 6-numbered ring of each node in layer i-2

NO

compute the number of nodes in layer i+1

i 2

Add 4 bonds of each node in layer i

Close 8-numbered ring of each node in layer i-3

Exchange nodes deleted in ring closing with nodes which do not belong to layer i+1

head: the head of linklistL: layerN: number of nodes