Effects can be unknown.Logical formLearned from243 sentences. An author can be unknown.Logical formLearned from237 sentences. An extent can be unknown.Logical formLearned from234 sentences. Origins can be unknown.Logical formLearned from233 sentences. Mechanisms can be unknown.Logical formLearned from232 sentences. Reasons can be unknown to a person.Logical formLearned from223 sentences. A date of a death can be unknown.Logical formLearned from217 sentences. A function can be unknown.Logical formLearned from201 sentences. A cause may remain unknown.Logical formLearned from187 sentences. Details can be unknown.Logical formLearned from173 sentences. An age can be unknown.Logical formLearned from168 sentences. An origin of a name can be unknown.Logical formLearned from168 sentences. Casualties can be unknown.Logical formLearned from167 sentences. A motive may remain unknown.Logical formLearned from165 sentences. A role can be unknown.Logical formLearned from163 sentences.