Variation can be in ph.Logical formLearned from4 sentences. A ph may pertain-to a (spray solution).Logical formLearned from4 sentences. Waters can be constituted-of-or-filled-with phs.Logical formLearned from4 sentences. (Ph levels) can be neutral.Logical formLearned from4 sentences. An increase can be in phs.Logical formLearned from4 sentences. A ph may be monitored.Logical formLearned from4 sentences. An effect can be on a ph.Logical formLearned from4 sentences. A patient can be with ph.Logical formLearned from4 sentences. An esophageal (ph monitoring) can be ambulatory.Logical formLearned from4 sentences. (Soil ph) may affect a (flower color).Logical formLearned from4 sentences. (Skin phs) can be suitable for some (skin types).Logical formLearned from4 sentences. (Transport and chemical determination) can be constituted-of-or-filled-with phs.Logical formLearned from4 sentences. Some ph can be constituted-of-or-filled-with buffer.Logical formLearned from4 sentences. A male may finish a ph.Logical formLearned from4 sentences. A ph may be required at a time of appointment.Logical formLearned from4 sentences.