CSV from Keywords Explorer (matching terms, related terms, etc). Several files at once are merged into one snapshot per country. Countries come from the Country column.
These words are stripped from a keyword to find its brand ("stake casino bonus login" → stake). There are built-in words (casino, bonus, login, app, opiniones, codigo, retiro, country names…). If junk clusters appear, add the culprit word here. Changes re-cluster everything instantly.