$(7$ points$)$

$($a$)$ the following program creates a list of $4000$ integers and then increases each number by $10$ parallelly by using $4$ threads. However, there is one error in using the threads. Please point it out and fix it$.($b$)$ what is the difference between the execution of the following two programs? Please explain the reasons. After that, please fix the problems of line $9$ and line $10$ of the $1$ st program so that the two programs have no running difference $($Note: no credits if change the $1$ st program exactly same as the $2$ nd$)$import concurrent,futuresdef thread $($num$,$ t$)$: print$("$Thread $\%$s started" $\%$num$)$ time.sleep$($t$)$with concurrent.futures. ThreadPoolExecutor$()$ as t: t$.$map$($thread$,(1,2),(3,6))$

$2$