A person may drill a well.Logical formLearned from4 sentences. A well may be drilled.Logical formLearned from4 sentences. (Test holes) may be drilled.Logical formLearned from4 sentences. A country may drill a way to (energy independence).Logical formLearned from4 sentences. Private companies may be drilled.Logical formLearned from4 sentences. Some wells may be drilled on leases.Logical formLearned from4 sentences. Oil may drill in a wildlife-refuge.Logical formLearned from4 sentences. Cores may be drilled.Logical formLearned from4 sentences. Some areas may be drilled.Logical formLearned from4 sentences. Crews may drill.Logical formLearned from4 sentences. Wells may be drilled in a state.Logical formLearned from4 sentences. Some (test wells) may be drilled.Logical formLearned from4 sentences. Limestone may be extracted by drilling.Logical formLearned from4 sentences. Granite may be drilled.Logical formLearned from4 sentences. (Copper ore) may be drilled.Logical formLearned from4 sentences.