An improvement can be in an index.Logical formLearned from40 sentences. An index can be quality.Logical formLearned from40 sentences. A (percentage gain) may pertain-to an index.Logical formLearned from40 sentences. An index may grow.Logical formLearned from40 sentences. Access can be to indexes.Logical formLearned from40 sentences. (Index cards) may pertain-to a person.Logical formLearned from40 sentences. An index can be volatile.Logical formLearned from40 sentences. A (composite index) may climb some percent.Logical formLearned from40 sentences. A (stock index) may fall by some percent.Logical formLearned from40 sentences. Components may pertain-to an index.Logical formLearned from40 sentences. Indexes can be constituted-of-or-filled-with stocks.Logical formLearned from40 sentences. An increase may pertain-to an index.Logical formLearned from40 sentences. An index may double.Logical formLearned from40 sentences. A (stock index) may undergo a performance.Logical formLearned from40 sentences. An index may be led.Logical formLearned from40 sentences.