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The Secret Life of Codes : It’s Maths with the Laughs Added in!
Kjartan Poskitt ; ill. by Philip Reeve 1st ed.. Scholastic, 2010 書
The Mean and Vulgarbits : It’s Maths with the Laughs Added in!
Kjartan Poskitt ; ill. by Philip Reeve 1st ed.. Scholastic, 2000 書
The Key to the Universe : It’s Maths with the Laughs Added In !
