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Ptaclusp IIa (Two-Ay) is one of the twin sons of Ptaclusp the pyramid builder. He is an accountant; the kind of accountant who would charge you for the amount of breath expended in saying "Good morning". He and his brother Ptaclusp IIb (To Be) are never without their belt abacuses (abaci?), with which one is constantly changing the shape of the world and the other, IIa, constantly deploring the cost. During the building of Ptaclusp's Folly, IIa invents both algebra and calculus as well as quantum accountancy to deal with the wages bill.

During the latter events of Pyramids, he becomes "dimensionally maladjusted" and flat as a shadow, but returns to normal with everything else. In fact, Queen Ptraci asks him to "have a look at" the royal finances, which he looks forward to with relish. His other hobbies consist mostly of arguing with his brother.

HIs name is a play on the traditional naming convention where each eldest son is named after his father (or paternal grandfather) and subsequent generations are defined by adding a new number; George Smith Senior, George Smith Junior, George Smith the third, George Smith the Fourth, etc. Ptaclusp Senior has followed this convention by naming his first born son after himself but since there are two he has added the subset letter. Clearly Ptaclusp IIa is the elder of the twins as 'a' is before 'b'.

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