An anion may feature a (hydrogen bond).Logical formLearned from3 sentences. A hydrogen may be filled.Logical formLearned from3 sentences. Investigations of a fine structure of (hydrogen lines) may provide a confirmation of a formula.Logical formLearned from3 sentences. A fine structure may pertain-to (hydrogen lines).Logical formLearned from3 sentences. A (hydrogen bond) can be between positions.Logical formLearned from3 sentences. Maintenance may indicate presence of a (hydrogen bond).Logical formLearned from3 sentences. A (hydrogen bond) can be required.Logical formLearned from3 sentences. Hydrogen may undergo an activation.Logical formLearned from3 sentences. A (hydrogen content) may pertain-to a fuel.Logical formLearned from3 sentences. A (hydrogen gas) can be dirigible.Logical formLearned from3 sentences. Bacteria may use (hydrogen sulfide).Logical formLearned from3 sentences. A hydrogen may be stored in a tank.Logical formLearned from3 sentences. A hydrogen may undergo a depletion.Logical formLearned from3 sentences. Hydrogen can be in materials.Logical formLearned from3 sentences. An alternative can be to the (hydrogen economy).Logical formLearned from3 sentences.