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Rule "missing hyphen in 'many to many'"

This is one of many errors that LanguageTool can detect.

Description: missing hyphen in 'many to many'
Message: It appears that two hyphens are missing.
Category: Grammar (ID: GRAMMAR)
Link: https://languagetool.org/insights/post/hyphen/#hyphenated-phrases-with-more-than-one-hyphen
Incorrect sentences
that this rule can detect:
  • In systems analysis, a many to many relationship is a type of cardinality that refers to the relationship between two entities.
    Correction suggestion: many-to-many
  • It is a one to many relationship.
    Correction suggestion: one-to-many
ID: ONE_TO_MANY_HYPHEN [2]
Version: 6.8-SNAPSHOT (2025-10-24 22:33:07 +0200)