帮你整理一下次序

金藤     (Harvard/Stanford/MIT) --- (Yale/Princeton) 
准金藤  Caltech, Penn-Wharton
银藤     Columbia, Penn-non-Wharton, Duke, Chicago, Brown, Dartmouth, Cornell, Northwestern, Johns Hopkins, Berkeley
准银藤  Rice, Vandy, Washington U, Emory, Georgetown, Michigan, UCLA ...