Question: In a different plan for area codes, the first digit could be any number from1 through6, the second digit was either5or6, and the third digit

In a different plan for area codes, the first digit could be any number from1 through6,

the second digit was either5or6, and the third digit could be any number except3,6,or9.

With this plan, how many different area codes are possible?

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