A (hydrogen potassium) can be a (proton pump) of a stomach.Logical formLearned from2 sentences. Hydrogen may be released at a cathode.Logical formLearned from2 sentences. 1s can be in a (hydrogen atom).Logical formLearned from2 sentences. A source of hydrogen may be needed.Logical formLearned from2 sentences. (Hydrogen ions) can be present in an ionosphere.Logical formLearned from2 sentences. Hydrogen may have a mass.Logical formLearned from2 sentences. A (hydrogen car initiative) can be (policy choice).Logical formLearned from2 sentences. A (hydrogen car initiative) may pertain-to a government.Logical formLearned from2 sentences. A material can be rich in hydrogen.Logical formLearned from2 sentences. Effects may pertain-to a (hydrogen bomb).Logical formLearned from2 sentences. Products may operate on (hydrogen gas).Logical formLearned from2 sentences. A metal may replace a (hydrogen atom).Logical formLearned from2 sentences. A structure may be stabilised by (hydrogen bonding).Logical formLearned from2 sentences. A (carbon dioxide atmosphere) can be with hydrogen.Logical formLearned from2 sentences. Salts can be with (hydrogen sulfide).Logical formLearned from2 sentences.