Ph may undergo changes.Logical formLearned from6 sentences. A ph may pertain-to meat.Logical formLearned from6 sentences. Buffers can be constituted-of-or-filled-with phs.Logical formLearned from6 sentences. Ph may be varied.Logical formLearned from6 sentences. Phs may determine that something-is-the-case.Logical formLearned from6 sentences. An increase can be in a ph.Logical formLearned from6 sentences. A ph may be reached.Logical formLearned from6 sentences. Ph may undergo solutions.Logical formLearned from6 sentences. A ph may be maintained.Logical formLearned from6 sentences. A ph can be biological.Logical formLearned from6 sentences. Information can be on ph.Logical formLearned from6 sentences. Ph can be acidic.Logical formLearned from6 sentences. Ph can be high.Logical formLearned from6 sentences. Activity can be at ph.Logical formLearned from6 sentences. (Ph levels) may pertain-to persons.Logical formLearned from6 sentences.