table: [['player', 'nationality', 'position', 'from', 'school / country'], ['robert sacre', 'canada', 'center', '2012', 'gonzaga'], ['john salley', 'united states', 'forward / center', '1999', 'georgia tech'], ['samake , soumaila soumaila samake', 'mali', 'center', '2002', 'mali'], ['jamal sampson', 'united states', 'forward / center', '2003', 'california'], ['frank saul', 'united states', 'guard / forward', '1951', 'seton hall'], ['herm schaefer', 'united states', 'guard / forward', '1948', 'indiana'], ['danny schayes', 'united states', 'center', '1993', 'syracuse'], ['dick schnittker', 'united states', 'forward', '1953', 'ohio state'], ['howie schultz', 'united states', 'forward / center', '1951', 'hamline'], ['byron scott', 'united states', 'guard', '1983 , 1996', 'arizona state'], ['charlie scott', 'united states', 'guard / forward', '1977', 'north carolina'], ['shea seals', 'united states', 'guard', '1997', 'tulsa'], ['frank selvy', 'united states', 'guard / forward', '1959', 'furman'], ['ramon sessions', 'united states', 'guard', '2012', 'nevada'], ['brian shaw', 'united states', 'guard', '1999', 'uc santa barbara'], ['bob sims', 'united states', 'guard / forward', '1961', 'pepperdine'], ['whitey skoog', 'united states', 'guard', '1951', 'minnesota'], ['bobby smith', 'united states', 'guard', '1959', 'west virginia'], ['don smith', 'united states', 'guard / forward', '1948', 'minnesota'], ['elmore smith', 'united states', 'center', '1973', 'kentucky state'], ['joe smith', 'united states', 'forward', '2010', 'maryland'], ['tony smith', 'united states', 'guard', '1990', 'marquette'], ['mike smrek', 'canada', 'center', '1986', 'canisius'], ['rory sparrow', 'united states', 'guard', '1991', 'villanova'], ['art spoelstra', 'united states', 'center', '1957', 'western kentucky'], ['larry spriggs', 'united states', 'forward', '1983', 'howard'], ['derek strong', 'united states', 'forward / center', '1995', 'xavier'], ['gene stump', 'united states', 'guard / forward', '1949', 'depaul'], ['don sunderlage', 'united states', 'guard', '1954', 'illinois']]
ref: the 2 Player from Canada are both in the Center Position
template: the 2 [ENT] from [ENT] are both in the [ENT] [ENT]