A strength may pertain-to (hydrogen bonds).Logical formLearned from4 sentences. Hydrogen may behave.Logical formLearned from4 sentences. Deuterium can be isotopes of hydrogen.Logical formLearned from4 sentences. Membranes can be for (hydrogen separation).Logical formLearned from4 sentences. A hydrogen may be used as a fuel.Logical formLearned from4 sentences. (Hydrogen bombs) can be unarmed.Logical formLearned from4 sentences. Some sources can be constituted-of-or-filled-with hydrogen.Logical formLearned from4 sentences. A halo can be constituted-of-or-filled-with hydrogen.Logical formLearned from4 sentences. Areas of a planet may contain amounts of hydrogen.Logical formLearned from4 sentences. A relationship can be between (hydrogen content).Logical formLearned from4 sentences. A bit can be constituted-of-or-filled-with hydrogen.Logical formLearned from4 sentences. Manufacturers may add hydrogen to vegetable.Logical formLearned from4 sentences. (Hydrogen atoms) may be added to sites.Logical formLearned from4 sentences. (Carbon atoms) can be with (hydrogen atoms).Logical formLearned from4 sentences. Hydrogen may mean that something-is-the-case.Logical formLearned from4 sentences.