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constructed in relation to a base sequence of a first pair part (FPP) and a second pair part (SPP) in which the core action underway is achieved. It can occur prior to the base FPP, between the base FPP and SPP, and following the base SPP.
* Pre-expansion: an adjacency pair that may be understood as preliminary to the main course of action. A generic pre-expansion is a summon-answer adjacency pair, as in "Mary?"/ "Yes?". It is generic in the sense that it does not contribute to any particular types of base adjacency pair, such as

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