deletions | additions       diff --git a/layout.md b/layout.md  index 5b1cc06..0bd11f9 100644  --- a/layout.md  +++ b/layout.md 
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section_Introduccton_To_Apache_Derby__.tex  section_Query_Optimization_and_Execution__.tex  figures/left-deep1/left-deep1.png  figures/bushy/bushy.png