A challenge may pertain-to a philosopher.Logical formLearned from19 sentences. Classes may pertain-to a philosopher.Logical formLearned from19 sentences. Works can be by philosophers.Logical formLearned from19 sentences. A philosopher can be of an opinion.Logical formLearned from19 sentences. A commentary may pertain-to a philosopher.Logical formLearned from19 sentences. A father can be a philosopher.Logical formLearned from19 sentences. Activities may pertain-to a philosopher.Logical formLearned from19 sentences. A companion can be to a philosopher.Logical formLearned from19 sentences. A stone may pertain-to philosopher.Logical formLearned from19 sentences. Brother may cradle upon philosophers.Logical formLearned from19 sentences. A truth may pertain-to a philosopher.Logical formLearned from19 sentences. A philosopher can be quintessential.Logical formLearned from19 sentences. Philosophers can be kings.Logical formLearned from19 sentences. A right may pertain-to a philosopher.Logical formLearned from19 sentences. A philosopher may be judged.Logical formLearned from19 sentences.