A product can be worthless.Logical formLearned from20 sentences. A local currency can be worthless.Logical formLearned from20 sentences. A day can be worthless.Logical formLearned from20 sentences. A property can be worthless.Logical formLearned from20 sentences. Words can be worthless.Logical formLearned from20 sentences. Persons can be worthless.Logical formLearned from19 sentences. A feeling can be worthless.Logical formLearned from19 sentences. A brother can be worthless.Logical formLearned from19 sentences. An object can be worthless.Logical formLearned from19 sentences. An endeavor can be worthless.Logical formLearned from19 sentences. A way can be worthless.Logical formLearned from19 sentences. A document can be worthless.Logical formLearned from19 sentences. A paper can be worthless.Logical formLearned from19 sentences. Trinkets can be worthless.Logical formLearned from19 sentences. Stuff can be worthless.Logical formLearned from19 sentences.