Let the sequence be
1 2 3 4 5 6 7 8 (=A)
if i select any 3 elements say 3,4,5 (=C) then B would be 1,2,6,7,8
On merging B and C i get 1,2,6,7,8,3,4,5 which is not in ascending order as A..
Can you please explain the case as here i am not getting A on merging....