корень в слове строить

Аноним: http://ru.wiktionary.org/wiki/%D1%81%D1%82%D1%80%D0%BE%D0%B8%D1%82%D1%8C#.D0.9C.D0.BE.D1.80.D1.84.D0.BE.D0.BB.D0.BE.D0.B3.D0.B8.D1.87.D0.B5.D1.81.D0.BA.D0.B8.D0.B5_.D0.B8_.D1.81.D0.B8.D0.BD.D1.82.D0.B0.D0.BA.D1.81.D0.B8.D1.87.D0.B5.D1.81.D0.BA.D0.B8.D0.B5_.D1.81.D0.B2.D0.BE.D0.B9.D1.81.D1.82.D0.B2.D0.B0