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When two-year colleges expanded to four-year curriculums, such as Rider, some of the chapters left their original organizations to join NPC groups. At Rider Sigma Iota Chi became Alpha Xi Delta, Zeta Mu Epsilon became Delta Zeta and Eta Upsilon Gamma became Zeta Tau Alpha. Also interesting, the Iota Alpha Pi chapter (a now defunct NPC group) chartered in 1947 and reverted to local status in 1955 as Iota Sigma Pi, joined Delta Phi Epsilon in 1962.
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