Write a complete sed script called minor$1.$sed that will modify the company$$s

letters in the following ways. Note that this letter is an example. Your program will be

tested against several similar letters. Note that spacing may be different in each

letter.

$1.$ Preprocessing:

a$.$ Change the area code of the phone number in the heading to $800.$

b$.$ Remove the parentheses from each phone number.

c$.$ Add a dash between the area code and the rest of the phone number. $($i$.$e$.$

$789123-4567$ would become $789-123-4567)$

d$.$ Change the zip$+4$ code in the heading from $4321$ to $1234.$ The zip$+4$ is the

last $4$ digits of the zip code after the dash.

e$.$ Change Lois$$ last name from Lane to Kent, since she became married.

f$.$ Change Lane in the addresses to Ln$.$

$2.$ Transposition $($i$.$e$.,$ rearrange the order of individual characters$)$:

a$.$ Swap the area code and exchange for the phone number in the body of the

letter.

$3.$ Substitution $($i$.$e$.,$ replace characters by other characters$)$:

a$.$ Substitute $$#$$ for $$@$$ to correct a type where $$@$$ were used instead of $$#$$

and c