An assembly line is to be designed to operate $7$h hours per day and supply a steady demand of $300$ units per day. Ilere are the tasks and their performance times:

$\backslash$table$[[$Task$,$Preceding Tasks,Porformance Time $($Seconds$)],[$a$,-,70],[$b$,-,40],[$c$,-,45],[$d$,$a$,10],[$e$,$b$,30],[$f$,$c$,20],[$g$,$d$,60],[$h$,$e$,50],[$I$,$f$,15],[$J$,$g$,25],[$k$,$h$.$l$,20],[$l$,$l$.$ k$,25]]$

a$.$ Draw the precedence diagram.

Pape$217$