rules :: [Rule]
rules =
  [ ruleAUnitofduration
  , ruleAboutDuration
  , ruleExactlyDuration
  , ruleHalfAnHour
  , ruleIntegerAndAnHalfHours
  , ruleIntegerMoreUnitofduration
  , ruleNumeralnumberHours
  ]
rules :: [Rule]
rules =
  [ ruleAUnitofduration
  , ruleAboutDuration
  , ruleExactlyDuration
  , ruleHalfAnHour
  , ruleIntegerAndAnHalfHours
  , ruleIntegerMoreUnitofduration
  , ruleNumeralnumberHours
  ]
rules =
  [ ruleAUnitofduration
  , ruleAboutDuration
  , ruleExactlyDuration
  , ruleHalfAnHour
  , ruleIntegerAndAnHalfHours
  , ruleIntegerMoreUnitofduration
  , ruleNumeralnumberHours
  ]