Potential answers for "Do painstaking research"

⭐⭐⭐⭐ DELVE
⭐⭐ DILIGENT
⭐⭐ STUDIOUS
⭐⭐ EXACT
⭐⭐ THOROUGH
⭐⭐ HASTIER
⭐⭐ THORO
⭐ LABTECH
⭐ LANGLEY

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