1->2->3->4->5

Start from any position ,have two pointers ,let that be a and b.Let a follow 
b,so that when b reaches right value ,a will be one node lacking,once b node 
is to be deleted,get the address of b node pointing and change the address 
of a pointing to the address b pointing to.

1->2->3->4->5
^ ^
|  |
a b

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