How to build a multi-taxonomy, multi-term query based on user input

I am a little fuzzy on specifics of technical side, but I think general outline would be following:

  1. Interface – you will need to either submit this as form by button or JavaScript.

  2. Query variables – you will need to register custom variable(s) via query_vars filter so your custom data is not discarded from URL.

  3. Query – modify query to make complex query, using custom data submitted.

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