Shouldn't it be the what_do_you_get_if_you_multiply_six_by_nine_then_subtract_twelve op?
No, it shouldn't. Meditate about it again and you will be enlightened.
Hint: "Base 13".
Greetings, Christian
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"The worst attitude of all would be the professional attitude which regards children in the lump as a sort of raw material which we have to handle." -- C.S. Lewis, On Three Ways of Writing for Children