Edges
tree [ 1 ] . append ( 2 ) NEW_LINE tree [ 2 ] . append ( 1 ) NEW_LINE tree [ 1 ] . append ( 3 ) NEW_LINE tree [ 3 ] . append ( 1 ) NEW_LINE tree [ 2 ] . append ( 4 ) NEW_LINE tree [ 4 ] . append ( 2 ) NEW_LINE tree [ 3 ] . append ( 5 ) NEW_LINE tree [ 5 ] . append ( 3 ) NEW_LINE