what are all the schools that participated in the great lakes invitational?
michigan, michigan state, michigan tech, western michigan, north dakota, toronto, new hampshire, colorado college, wisconsin, boston college, notre dame, boston university, harvard, maine, ohio state, rensselaer polytechnic institute, lake superior state, northern michigan, colgate, dartmouth, providence, brown, cornell, princeton, st lawrence, yale, bowling green, pennsylvania, western ontario
what is the longest number of years a school participated for?
49
which school participated that amount of years?
michigan tech