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sdm.md

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+### Sequential Dependence Model
+
+The Sequential Dependence Model (SDM) re-writes queries to boost terms that appear in sequence or in proximity with one another.
+It functions as a `Q→Q` (query re-writing, query-to-query) transformer, and can be used in pipelines as such.
+
+<div class="pipeline">
+  <div class="df" title="Query Frame">Q</div>
+  <div class="transformer attn" title="SDM Transformer">SDM</div>
+  <div class="df" title="Query Frame">Q</div>
+</div>