A classification can be valid.Logical formLearned from8 sentences. Classifications can be systematic.Logical formLearned from8 sentences. A classification can be as (enemy combatants).Logical formLearned from8 sentences. A (classification system) may undergo a revision.Logical formLearned from8 sentences. A sum may pertain-to (team classifications).Logical formLearned from8 sentences. (Team classifications) can be daily.Logical formLearned from8 sentences. Classification can be impossible.Logical formLearned from8 sentences. A classification can be flexible.Logical formLearned from8 sentences. Some classification can be a young (rider classification).Logical formLearned from8 sentences. A classification can be demographic.Logical formLearned from8 sentences. Schools may undergo a classification.Logical formLearned from8 sentences. Spaces may undergo a classification.Logical formLearned from8 sentences. Diseases may undergo a classification.Logical formLearned from8 sentences. Households may undergo a classification.Logical formLearned from8 sentences. A (hull classification symbol) may pertain-to a military-or-other-action-organization.Logical formLearned from8 sentences.