Stratigraph

Painted Hills, Oregon (https://commons.wikimedia.org/wiki/File:Painted_Hills_(8384915639).jpg)
FIG 1. Stratigraph example for a gun violence database
FIG 2. Query “spire” based on “Perpetrators” and built up layer by layer to “Incident Type”
FIG 3. Drag and drop of layers easily reorders query predicates
FIG 4. Multiple selection to AND (or OR) predicate values together
FIG 5. Blocks expand dynamically for visibility and selection

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