A casing may pertain-to a well.Logical formLearned from31 sentences. An (oil well) may pertain-to a country.Logical formLearned from31 sentences. Wells can be in an area.Logical formLearned from30 sentences. A potential well can be gravitational.Logical formLearned from30 sentences. Wells may be contaminated.Logical formLearned from30 sentences. Depths may pertain-to a well.Logical formLearned from30 sentences. Wells can be damaged.Logical formLearned from30 sentences. A portfolio may pertain-to a (sleep well).Logical formLearned from30 sentences. A (sleep well) can be simple.Logical formLearned from30 sentences. Well can be over a decade.Logical formLearned from30 sentences. A wall may pertain-to a well.Logical formLearned from30 sentences. A percent may pertain-to a well.Logical formLearned from30 sentences. Some wells can be in a field.Logical formLearned from30 sentences. Wells can be unprotected.Logical formLearned from30 sentences. A well may be located.Logical formLearned from30 sentences.