A symbol can be blank.Logical formLearned from3 sentences. An invitation can be blank.Logical formLearned from3 sentences. A marble can be blank.Logical formLearned from3 sentences. Protoforms can be blank.Logical formLearned from3 sentences. Variety can be blank.Logical formLearned from3 sentences. Children can be a blank slate.Logical formLearned from3 sentences. A (comment field) can be blank.Logical formLearned from3 sentences. Transcripts can be blank.Logical formLearned from3 sentences. Avatars can be blank slates.Logical formLearned from3 sentences. A label can be blank.Logical formLearned from3 sentences. A stele can be blank.Logical formLearned from3 sentences. A third can be blank.Logical formLearned from3 sentences. A name of a father may be left blank.Logical formLearned from3 sentences. Peaks can be blank.Logical formLearned from3 sentences. Vinyls can be blank.Logical formLearned from3 sentences.