Question: How to relabel only a subset of vertex of G

How relabel only one particular vertex of G of my choice. others will remain as it is

Function I want to create 



I want to relabel only that particalur S subset V of G where S is list with say the K is a list of labels to be assigned the corrsponding vertices i paased in S. 

end proc;

Where v:=V[i] the vertex , k can be a character like       a or 1 or [1,2,3,4] or anything

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