deletions | additions       diff --git a/layout.md b/layout.md  index 5e5be18..5befb2e 100644  --- a/layout.md  +++ b/layout.md 
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Pointer_to_strided_memory__.md  Labeled_arrays__.md  Columnar_containers_Columna_containers_are__.md  Graph_structures__.md Graph_structures_A_simple_graph__.md  Resilient_Distributed_Datasets__.md  Implementation_specific_the_NumPy_ndarray__.md  Implementation_specific_the_R_data__.md