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Rule "Compound adjective: dual purpose"

This is one of many errors that LanguageTool can detect.

Description: Compound adjective: dual purpose
Message: '\1 \2' seems to be a compound adjective before a noun. Use a hyphen: <suggestion>\1-\2</suggestion>.
Category: Grammar (ID: GRAMMAR)
Link: https://languagetool.org/insights/post/spelling-dual-vs-duel/
Incorrect sentences
that this rule can detect:
  • This is a dual purpose test.
    Correction suggestion: dual-purpose
ID: CA_DUAL_PURPOSE [11]
Version: 6.6-SNAPSHOT (2024-12-03 22:33:10 +0100)