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Hello,  I've read the whole topic but can't figure it out, can you explain in detail how to do this:

How to generate routing files
- Download the raw openstreetmap file (pbf files)
- Execute ./graphhopper.sh import <your-osm-file>. This creates the routing data

where can I download raw openstreetmap file? how to create the routing file what should I use to create it, and once I get it where should I place it? Sorry for newbs questions