Definition: In this task, you are given triplets. Each triplet is in the form of [subject, predicate, object]. Your task is to generate proper sentence that utilizes these triples. The objective is to construct a sentence that (a) captures the facts specified in the triples and (b) is a well-formed sentence easily understandable by a human. All triple values need not be used directly in the sentence as long as the facts are adequately captured.
Input: [['Pa', 'DENSITY,_G/CM3', '15.37'], ['[TABLECONTEXT]', 'FORMULA', 'Pa'], ['Pa', 'SYMMETRY', 'tetragonal'], ['Pa', 'COLOR', 'silvery-gray'], ['[TABLECONTEXT]', '[TITLE]', 'Protactinium'], ['Pa', 'PEARSON_SYMBOL', 'tI2']]

Protactinium is a silvery-gray element with tetragonal symmetry, with 15.37 g/cm3 density and a Pearson symbol of tl2.