!Keyword: PERT/CPM;
Minimize   I - A
st
B - A >=  3          ! DIG
C - B >=  4          ! FOUND
E - C >=  2              .
D - C >=  3              .
E - C >=  5              .
F - D >=  4
G - E >=  3
H - F >=  6
H - G >=  7
I - H >=  5
I - E >=  2
 END
