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==P==
*'''Pajottenland:''' Sometimes written in English as ''Payottenland'', this extremely fertile agricultural region of Belgium is situated in a valley to the south-west of Brussels between the rivers Senne and Dendre and is cradle of lambic production. *'''[http://en.wikipedia.org/wiki/PH pH]:''' The negative logarithm of hydrogen ion concentration. A measure of acidity, where lower is more acidic
==Q==