A company prints contest codes on its fun-size bags of candy. Each 6-character code consists of the letter A followed by the letter H followed by 4 of the digits 0 through 9. The digits may repeat. Which of the following expressions gives the number of different 6-character codes that are possible?

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There are 6 characters. The first two characters are fixed, and there is only 1 option. The other 4 characters can be any of the 10 digits from 0 to 9.

$$ \boxed{1(1)(10)(10)(10)(10)} $$