Using the history mechanism, give commands to

Assume that you are working with the following history list:
37 mail zach
38 cd /home/sam/correspondence/business/cheese_co
39 less letter.0321
40 vim letter.0321
41 cp letter.0321 letter.0325
42 grep hansen letter.0325
43 vim letter.0325
44 lpr letter*
45 cd ../milk_co
46 pwd
47 vim wilson.0321 wilson.0329

a. Send mail to Zach.
b. Use vim to edit a file named wilson.0329.
c. Send wilson.0329 to the printer.
d. Send both wilson.0321 and wilson.0329 to the printer.

a. $ !mail
b. $ vim !$
c. $ lpr !$
d. $ ^vim^lpr