An unit may have upgrades.Logical formLearned from12 sentences. An upgrade can be from season.Logical formLearned from12 sentences. An upgrade may pertain-to a machine.Logical formLearned from12 sentences. Problems can be with an upgrade.Logical formLearned from12 sentences. An upgrade can be at a position.Logical formLearned from12 sentences. Upgrade can be to tanks.Logical formLearned from12 sentences. A male may represent an upgrade.Logical formLearned from12 sentences. A round can be constituted-of-or-filled-with upgrades.Logical formLearned from12 sentences. An upgrade may pertain-to a track.Logical formLearned from12 sentences. Upgrades can be constituted-of-or-filled-with windows.Logical formLearned from12 sentences. Some upgrades can be to a system.Logical formLearned from12 sentences. An upgrade can be constituted-of-or-filled-with facilities.Logical formLearned from12 sentences. A person may purchase an upgrade.Logical formLearned from12 sentences. An upgrade can be to hardware.Logical formLearned from12 sentences. An upgrade may pertain-to a weekday.Logical formLearned from12 sentences.