Bikers can be female.Logical formLearned from25 sentences. A male can be (mountain biker).Logical formLearned from24 sentences. A leader may pertain-to a (biker gang).Logical formLearned from23 sentences. A biker can be serious.Logical formLearned from22 sentences. (Biker boots) can be black.Logical formLearned from21 sentences. Bikers can be hard-core.Logical formLearned from21 sentences. A (biker rally) can be annual.Logical formLearned from20 sentences. A jacket may pertain-to a biker.Logical formLearned from20 sentences. A person can be a (mountain biker).Logical formLearned from19 sentences. A biker can be hard-core.Logical formLearned from19 sentences. A (biker jacket) can be black.Logical formLearned from19 sentences. A biker may ride by a zoo.Logical formLearned from17 sentences. A band can be constituted-of-or-filled-with bikers.Logical formLearned from17 sentences. A bid can be by thousands of bikers.Logical formLearned from17 sentences. A biker can be mature.Logical formLearned from16 sentences.