$2\mathrm{.}3$ Construct the network diagram $($Activity on Node $$ AON$).(15)$

ACTIVITY PREDECESSOR MOST OPTIMISTIC

$($DAYS$)$

MOST LIKELY

$($DAYS$)$

MOST PESSIMISTIC

$($DAYS$)$

A $-6916$

B A $111520$

C A $2610$

D B $101215$

E B $256$

F C $4612$

G E;F $6914$

H D;E $3711$

I H;G $369$