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In this lecture, we discuss the Calabi Yau threefold X_{3.3} in P^2 x P^2. We hope to find the A-model counterpart of the normalize basis, propagators, polynomiality, etc. In this correspondence, the equation for the propagators is crucial, which was originally introduced by Alim-L¨ange in physics. We hope to explain how it fit into our A-model framework.