# functions go here


def yes_no (question):
    """check the user says yes / no / y / n (y/n), returns 'yes' or 'no' """
    while True:

        response =input(question).lower()


       
        if response == "yes" or response == "y" :
            return "yes"
        elif response == "no" or response == "n" :
           return "no"
        else:
            print("please enter yes / no")




# Main routine

testing loop...
while True:
want_instructions =yes_no("Do you want to see the instructions").lower()
print(f"you chose {want_instructions}")

print("we done")