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Part $1$

Using$$ Johnson's rule for$2-$machine scheduling, the sequence$$ is:

Part $2$Part $3$Part $4$Part $5$Part $6$

Scheduled Order

Job

$1$

B

$2$

F

$3$

A

$4$

D

$5$

C

$6$

E

Part $7$

For the schedule developed using$$ Johnson's rule, the total length of time taken to complete the six jobs$($including the $2$nd$$ operation$)=$