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A real challenge in speculative searching is that you must decide which keywords are 'GOOD AS IS' and which ones need to be replaced by professional language or a synonym.

Based on the query challenge shown, decide which keywords are necessary for an effective query.
Drag and drop the keywords to be substituted in the search box.

Leave the other keywords where they are.

Drag and drop keywords to be substituted to the box

2 tries
blue gem
what priceless blue gem changes color when exposed to black light