A (recognition requirement) can be sustained.Logical formLearned from2 sentences. (Revenue sources) can be sustained.Logical formLearned from2 sentences. A comfort can be sustained.Logical formLearned from2 sentences. Months can be sustained.Logical formLearned from2 sentences. A crusade can be sustained.Logical formLearned from2 sentences. A ride can be sustained.Logical formLearned from2 sentences. A coarseness can be sustained.Logical formLearned from2 sentences. A road can be sustained.Logical formLearned from2 sentences. Poses can be sustained.Logical formLearned from2 sentences. An (allied bombing campaign) can be sustained.Logical formLearned from2 sentences. A redevelopment can be sustained.Logical formLearned from2 sentences. A robotic exploration can be sustained.Logical formLearned from2 sentences. A sustained chord can be by an orchestra.Logical formLearned from2 sentences. (Flute figurations) can be over a sustained chord.Logical formLearned from2 sentences. Weeks can be sustained.Logical formLearned from2 sentences.