A person may pay for an upgrade.Logical formLearned from15 sentences. A website may look for upgrades.Logical formLearned from15 sentences. A person may qualify for an upgrade.Logical formLearned from15 sentences. Version can be an upgrade.Logical formLearned from15 sentences. Upgrades can be mandatory.Logical formLearned from15 sentences. Windows can be an upgrade.Logical formLearned from15 sentences. An upgrade may be finished.Logical formLearned from15 sentences. Upgrades can be high-tech.Logical formLearned from15 sentences. An upgrade may occur.Logical formLearned from15 sentences. Upgrades may pertain-to (rudder control systems).Logical formLearned from15 sentences. An upgrade can be long-term.Logical formLearned from15 sentences. Upgrades can be to a building.Logical formLearned from14 sentences. Upgrades can be necessary.Logical formLearned from14 sentences. A host can be constituted-of-or-filled-with upgrades.Logical formLearned from14 sentences. Upgrades can be popular.Logical formLearned from14 sentences.