Consider the following tasks that must be assigned to $4$ workers on a conveyor$-$paced

assembly line $($i$.$e$.,$ a machine$-$paced line flow$).$ Each worker must perform at least $1$

task. There is unlimited demand.

The current conveyor$-$paced assembly$-$line configuration assigns the workers in the

following way:

$$ Worker $1$: Tasks $1,2,3$

$$ Worker $2$: Tasks $4,5,6$

$$ Worker $3$: Tasks $7,8,9$

$$ Worker $4$: Tasks $10,11,12$