15 / \ 10 20 / \ / \ 8 12 16 25
tree . insert ( 15 ) ; tree . insert ( 10 ) ; tree . insert ( 20 ) ; tree . insert ( 8 ) ; tree . insert ( 12 ) ; tree . insert ( 16 ) ; tree . insert ( 25 ) ; tree . isPairPresent ( tree . root , 33 ) ; } }