Create undirected edges initialize the tree given in the diagram
v [ 1 ] . append ( 2 ) , v [ 2 ] . append ( 1 ) NEW_LINE v [ 1 ] . append ( 3 ) , v [ 3 ] . append ( 1 ) NEW_LINE v [ 1 ] . append ( 4 ) , v [ 4 ] . append ( 1 ) NEW_LINE v [ 2 ] . append ( 5 ) , v [ 5 ] . append ( 2 ) NEW_LINE v [ 2 ] . append ( 6 ) , v [ 6 ] . append ( 2 ) NEW_LINE v [ 3 ] . append ( 7 ) , v [ 7 ] . append ( 3 ) NEW_LINE v [ 4 ] . append ( 8 ) , v [ 8 ] . append ( 4 ) NEW_LINE v [ 4 ] . append ( 9 ) , v [ 9 ] . append ( 4 ) NEW_LINE v [ 4 ] . append ( 10 ) , v [ 10 ] . append ( 4 ) NEW_LINE v [ 5 ] . append ( 11 ) , v [ 11 ] . append ( 5 ) NEW_LINE v [ 5 ] . append ( 12 ) , v [ 12 ] . append ( 5 ) NEW_LINE v [ 7 ] . append ( 13 ) , v [ 13 ] . append ( 7 ) NEW_LINE v [ 7 ] . append ( 14 ) , v [ 14 ] . append ( 7 ) NEW_LINE