[BUG] Final query in OC Over RDF notebook returns no results

[charlesivie]

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Describe the bug
The final query in OC Over RDF notebook returns no results. This is because a modification query is needed before this query.

• Graph Notebook Version: all

To Reproduce
Steps to reproduce the behavior:
Execute final query in notebook 02-Air-Routes-GeoNames.ipynb

To fix: insert new modification query to add missing edge.