STEP 17: Let's store the value from our last return so that we can use it outside of all the functions.

• From , drag Subtract Value to the bottom of the program.
• Change the variable my_var to computer_hp and the value 1 to damage. This subtracts the damage from HP!
• Drag Update Display to the next line. Change my_display to computer_display and my_var to computer_hp. Click Run and choose a spell. You should now see the computer_hp decrease!

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