Q$\mathrm{.}2.(20$pts$).$ We have such a $"2-3$ tree" on the right.

Do the following step by step;

a$.$ Insert $120,$

b$.$ Insert $130,$

c$.$ Insert $140,$

d$.$ Delete $60,$

e$.$ Delete $50,$

f$.$ Delete $40,$ operations respectively to the tree

$\backslash$table$[[$Insert $120,$Insert $130],[,],[$Insert $140,],[,$Delete $60],[,],[$Delete $50,],[,],[,],[,],[,],[,],[,],[,]]$