Rank the following glasses by softening temperature (highest to lowest):
(a) PyrexTM (81% SiO2, 2% Al2O3, 4% Na2O, 12% B2O3);
(b) Lime glass (72% SiO2, 1% Al2O3, 10% CaO, 14% Na2O); and
(c) VycorTM (96% SiO2, 4% B2O3).
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