Blue-green algae may choke a lake.Logical formLearned from4 sentences. An algae may block (sailing routes).Logical formLearned from4 sentences. A covering of algae may be smothered.Logical formLearned from4 sentences. Algae can be in a lake.Logical formLearned from4 sentences. An excess of blue-green algae may remove oxygen from water.Logical formLearned from4 sentences. An excess can be constituted-of-or-filled-with blue-green algae.Logical formLearned from4 sentences. Blue-green algae may grow in water.Logical formLearned from4 sentences. An (algae outbreak) can be blue-green.Logical formLearned from4 sentences. A level may trigger a growth of blue algae.Logical formLearned from4 sentences. Blue-green algae can be a form of aquatic plant.Logical formLearned from4 sentences. (Algae pollution) may be caused by an influx of (waste water).Logical formLearned from4 sentences. An algae can be unwanted.Logical formLearned from4 sentences. Algae may undergo a picking.Logical formLearned from4 sentences. Algae may be encouraged by chemicals.Logical formLearned from4 sentences. Red algae may undergo a grouping.Logical formLearned from4 sentences.